Random old code for BCI.

1 files changed, 2517 insertions, 0 deletions

diff --git a/web/build/dragdrop-debug.js b/web/build/dragdrop-debug.js
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+/*
+Copyright (c) 2006 Yahoo! Inc. All rights reserved.
+version 0.9.0
+*/
+
+/**
+ * @class Defines the interface and base operation of items that that can be
+ * dragged or can be drop targets.  It was designed to be extended, overriding
+ * the event handlers for startDrag, onDrag, onDragOver, onDragOut.
+ * Up to three html elements can be associated with a DragDrop instance:
+ * <ul>
+ * <li>linked element: the element that is passed into the constructor.
+ * This is the element which defines the boundaries for interaction with
+ * other DragDrop objects.</li>
+ * <li>handle element(s): The drag operation only occurs if the element that
+ * was clicked matches a handle element.  By default this is the linked
+ * element, but there are times that you will want only a portion of the
+ * linked element to initiate the drag operation, and the setHandleElId()
+ * method provides a way to define this.</li>
+ * <li>drag element: this represents an the element that would be moved along
+ * with the cursor during a drag operation.  By default, this is the linked
+ * element itself as in {@link YAHOO.util.DD}.  setDragElId() lets you define
+ * a separate element that would be moved, as in {@link YAHOO.util.DDProxy}
+ * </li>
+ * </ul>
+ * This class should not be instantiated until the onload event to ensure that
+ * the associated elements are available.
+ * The following would define a DragDrop obj that would interact with any
+ * other * DragDrop obj in the "group1" group:
+ * <pre>
+ *  dd = new YAHOO.util.DragDrop("div1", "group1");
+ * </pre>
+ * Since none of the event handlers have been implemented, nothing would
+ * actually happen if you were to run the code above.  Normally you would
+ * override this class or one of the default implementations, but you can
+ * also override the methods you want on an instance of the class...
+ * <pre>
+ *  dd.onDragDrop = function(e, id) {
+ *   alert("dd was dropped on " + id);
+ *  }
+ * </pre>
+ * @constructor
+ * @param {String} id of the element that is linked to this instance
+ * @param {String} sGroup the group of related DragDrop objects
+ */
+YAHOO.util.DragDrop = function(id, sGroup) {
+    if (id) {
+        this.init(id, sGroup);
+    }
+};
+
+YAHOO.util.DragDrop.prototype = {
+
+    /**
+     * The id of the element associated with this object.  This is what we
+     * refer to as the "linked element" because the size and position of
+     * this element is used to determine when the drag and drop objects have
+     * interacted.
+     *
+     * @type String
+     */
+    id: null,
+
+    /**
+     * The id of the element that will be dragged.  By default this is same
+     * as the linked element , but could be changed to another element. Ex:
+     * YAHOO.util.DDProxy
+     *
+     * @type String
+     * @private
+     */
+    dragElId: null,
+
+    /**
+     * the id of the element that initiates the drag operation.  By default
+     * this is the linked element, but could be changed to be a child of this
+     * element.  This lets us do things like only starting the drag when the
+     * header element within the linked html element is clicked.
+     *
+     * @type String
+     * @private
+     */
+    handleElId: null,
+
+    /**
+     * An array of HTML tags that will be ignored if clicked.
+     */
+    invalidHandleTypes: null,
+
+    /**
+     * The linked element's absolute X position at the time the drag was
+     * started
+     *
+     * @type int
+     * @private
+     */
+    startPageX: 0,
+
+    /**
+     * The linked element's absolute X position at the time the drag was
+     * started
+     *
+     * @type int
+     * @private
+     */
+    startPageY: 0,
+
+    /**
+     * The group defines a logical collection of DragDrop objects that are
+     * related.  Instances only get events when interacting with other
+     * DragDrop object in the same group.  This lets us define multiple
+     * groups using a single DragDrop subclass if we want.
+     *
+     */
+    groups: null,
+
+    /**
+     * Individual drag/drop instances can be locked.  This will prevent
+     * onmousedown start drag.
+     *
+     * @type boolean
+     * @private
+     */
+    locked: false,
+
+    /**
+     * Lock this instance
+     */
+    lock: function() { this.locked = true; },
+
+    /**
+     * Unlock this instace
+     */
+    unlock: function() { this.locked = false; },
+
+    /**
+     * By default, all insances can be a drop target.  This can be disabled by
+     * setting isTarget to false.
+     *
+     * @type boolean
+     */
+    isTarget: true,
+
+    /**
+     * The padding configured for this drag and drop object for calculating
+     * the drop zone intersection with this object.
+     */
+    padding: null,
+
+    /**
+     * @private
+     */
+    _domRef: null,
+
+    /**
+     * Internal typeof flag
+     * @private
+     */
+    __ygDragDrop: true,
+
+    /**
+     * Set to true when horizontal contraints are applied
+     *
+     * @type boolean
+     * @private
+     */
+    constrainX: false,
+
+    /**
+     * Set to true when vertical contraints are applied
+     *
+     * @type boolean
+     * @private
+     */
+    constrainY: false,
+
+    /**
+     * The left constraint
+     *
+     * @type int
+     * @private
+     */
+    minX: 0,
+
+    /**
+     * The right constraint
+     *
+     * @type int
+     * @private
+     */
+    maxX: 0,
+
+    /**
+     * The up constraint
+     *
+     * @type int
+     * @private
+     */
+    minY: 0,
+
+    /**
+     * The down constraint
+     *
+     * @type int
+     * @private
+     */
+    maxY: 0,
+
+    /**
+     * Maintain offsets when we resetconstraints.  Used to maintain the
+     * slider thumb value, and this needs to be fixed.
+     * @type boolean
+     */
+    maintainOffset: false,
+
+    /**
+     * Array of pixel locations the element will snap to if we specified a
+     * horizontal graduation/interval.  This array is generated automatically
+     * when you define a tick interval.
+     * @type int[]
+     */
+    xTicks: null,
+
+    /**
+     * Array of pixel locations the element will snap to if we specified a
+     * vertical graduation/interval.  This array is generated automatically
+     * when you define a tick interval.
+     * @type int[]
+     */
+    yTicks: null,
+
+    /**
+     * By default the drag and drop instance will only respond to the primary
+     * button click (left button for a right-handed mouse).  Set to true to
+     * allow drag and drop to start with any mouse click that is propogated
+     * by the browser
+     * @type boolean
+     */
+    primaryButtonOnly: true,
+
+    /**
+     * Code that executes immediately before the startDrag event
+     * @private
+     */
+    b4StartDrag: function(x, y) { },
+
+    /**
+     * Abstract method called after a drag/drop object is clicked
+     * and the drag or mousedown time thresholds have beeen met.
+     *
+     * @param {int} X click location
+     * @param {int} Y click location
+     */
+    startDrag: function(x, y) { /* override this */ },
+
+    /**
+     * Code that executes immediately before the onDrag event
+     * @private
+     */
+    b4Drag: function(e) { },
+
+    /**
+     * Abstract method called during the onMouseMove event while dragging an
+     * object.
+     *
+     * @param {Event} e
+     */
+    onDrag: function(e) { /* override this */ },
+
+    /**
+     * Code that executes immediately before the onDragEnter event
+     * @private
+     */
+    // b4DragEnter: function(e) { },
+
+    /**
+     * Abstract method called when this element fist begins hovering over
+     * another DragDrop obj
+     *
+     * @param {Event} e
+     * @param {String || YAHOO.util.DragDrop[]} id In POINT mode, the element
+     * id this is hovering over.  In INTERSECT mode, an array of one or more
+     * dragdrop items being hovered over.
+     */
+    onDragEnter: function(e, id) { /* override this */ },
+
+    /**
+     * Code that executes immediately before the onDragOver event
+     * @private
+     */
+    b4DragOver: function(e) { },
+
+    /**
+     * Abstract method called when this element is hovering over another
+     * DragDrop obj
+     *
+     * @param {Event} e
+     * @param {String || YAHOO.util.DragDrop[]} id In POINT mode, the element
+     * id this is hovering over.  In INTERSECT mode, an array of dd items
+     * being hovered over.
+     */
+    onDragOver: function(e, id) { /* override this */ },
+
+    /**
+     * Code that executes immediately before the onDragOut event
+     * @private
+     */
+    b4DragOut: function(e) { },
+
+    /**
+     * Abstract method called when we are no longer hovering over an element
+     *
+     * @param {Event} e
+     * @param {String || YAHOO.util.DragDrop[]} id In POINT mode, the element
+     * id this was hovering over.  In INTERSECT mode, an array of dd items
+     * that the mouse is no longer over.
+     */
+    onDragOut: function(e, id) { /* override this */ },
+
+    /**
+     * Code that executes immediately before the onDragDrop event
+     * @private
+     */
+    b4DragDrop: function(e) { },
+
+    /**
+     * Abstract method called when this item is dropped on another DragDrop
+     * obj
+     *
+     * @param {Event} e
+     * @param {String || YAHOO.util.DragDrop[]} id In POINT mode, the element
+     * id this was dropped on.  In INTERSECT mode, an array of dd items this
+     * was dropped on.
+     */
+    onDragDrop: function(e, id) { /* override this */ },
+
+    /**
+     * Code that executes immediately before the endDrag event
+     * @private
+     */
+    b4EndDrag: function(e) { },
+
+    /**
+     * Fired when we are done dragging the object
+     *
+     * @param {Event} e
+     */
+    endDrag: function(e) { /* override this */ },
+
+    /**
+     * Code executed immediately before the onMouseDown event
+
+     * @param {Event} e
+     * @private
+     */
+    b4MouseDown: function(e) {  },
+
+    /**
+     * Event handler that fires when a drag/drop obj gets a mousedown
+     * @param {Event} e
+     */
+    onMouseDown: function(e) { /* override this */ },
+
+    /**
+     * Event handler that fires when a drag/drop obj gets a mouseup
+     * @param {Event} e
+     */
+    onMouseUp: function(e) { /* override this */ },
+
+    /**
+     * Returns a reference to the linked element
+     *
+     * @return {Object} the html element
+     */
+    getEl: function() {
+        if (!this._domRef) {
+            this._domRef = this.DDM.getElement(this.id);
+        }
+
+        return this._domRef;
+    },
+
+    /**
+     * Returns a reference to the actual element to drag.  By default this is
+     * the same as the html element, but it can be assigned to another
+     * element. An example of this can be found in YAHOO.util.DDProxy
+     *
+     * @return {Object} the html element
+     */
+    getDragEl: function() {
+        return this.DDM.getElement(this.dragElId);
+    },
+
+    /**
+     * Sets up the DragDrop object.  Must be called in the constructor of any
+     * YAHOO.util.DragDrop subclass
+     *
+     * @param id the id of the linked element
+     * @param {String} sGroup the group of related items
+     * element is supposed to be a target only, set to false.
+     */
+    init: function(id, sGroup) {
+        this.initTarget(id, sGroup);
+        YAHOO.util.Event.addListener(id, "mousedown",
+                                          this.handleMouseDown, this, true);
+    },
+
+    /**
+     * Initializes Targeting functionality only... the object does not
+     * get a mousedown handler.
+     *
+     * @param id the id of the linked element
+     * @param {String} sGroup the group of related items
+     * element is supposed to be a target only, set to false.
+     */
+    initTarget: function(id, sGroup) {
+
+        // create a local reference to the drag and drop manager
+        this.DDM = YAHOO.util.DDM;
+
+        // create a logger instance
+        this.logger = new ygLogger("DragDrop");
+
+        // set the default padding
+        this.padding = [0, 0, 0, 0];
+
+        // initialize the groups array
+        this.groups = {};
+
+        // set the id
+        this.id = id;
+
+        // the element is a drag handle by default
+        this.setDragElId(id);
+
+        // by default, clicked anchors will not start drag operations
+        this.invalidHandleTypes = {a : "a"};
+
+        // We don't want to register this as the handle with the manager
+        // so we just set the id rather than calling the setter
+        this.handleElId = id;
+
+        // cache the position of the element if we can
+        if (document && document.body) {
+            this.setInitPosition();
+        }
+
+        // add to an interaction group
+        this.addToGroup((sGroup) ? sGroup : "default");
+
+    },
+
+    /**
+     * Configures the padding for the target zone in px.  Effectively expands
+     * (or reduces) the virtual object size for targeting calculations.
+     * Supports css-style shorthand; if only one parameter is passed, all sides
+     * will have that padding, and if only two are passed, the top and bottom
+     * will have the first param, the left and right the second.
+     * @param {int} iTop    Top pad
+     * @param {int} iRight  Right pad
+     * @param {int} iBot    Bot pad
+     * @param {int} iLeft   Left pad
+     */
+    setPadding: function(iTop, iRight, iBot, iLeft) {
+        // this.padding = [iLeft, iRight, iTop, iBot];
+        if (!iRight && 0 !== iRight) {
+            this.padding = [iTop, iTop, iTop, iTop];
+        } else if (!iBot && 0 !== iBot) {
+            this.padding = [iTop, iRight, iTop, iRight];
+        } else {
+            this.padding = [iTop, iRight, iBot, iLeft];
+        }
+    },
+
+    /**
+     * Stores the initial placement of the dd element
+     */
+    setInitPosition: function(diffX, diffY) {
+        var el = this.getEl();
+
+        if (!this.DDM.verifyEl(el)) {
+            this.logger.debug(this.id + " element is broken");
+            return;
+        }
+
+        var dx = diffX || 0;
+        var dy = diffY || 0;
+
+        var p = YAHOO.util.Dom.getXY( el );
+
+        this.initPageX = p[0] - dx;
+        this.initPageY = p[1] - dy;
+
+        this.lastPageX = p[0];
+        this.lastPageY = p[1];
+
+        this.setStartPosition(p);
+    },
+
+    /**
+     * Sets the start position of the element.  This is set when the obj
+     * is initialized, the reset when a drag is started.
+     * @param pos current position (from previous lookup)
+     * @private
+     */
+    setStartPosition: function(pos) {
+
+        var p = pos || YAHOO.util.Dom.getXY( this.getEl() );
+
+        this.startPageX = p[0];
+        this.startPageY = p[1];
+    },
+
+    /**
+     * Add this instance to a group of related drag/drop objects.  All
+     * instances belong to at least one group, and can belong to as many
+     * groups as needed.
+     *
+     * @param sGroup {string} the name of the group
+     */
+    addToGroup: function(sGroup) {
+        this.groups[sGroup] = true;
+        this.DDM.regDragDrop(this, sGroup);
+    },
+
+    /**
+     * Allows you to specify that an element other than the linked element
+     * will be moved with the cursor during a drag
+     *
+     * @param id the id of the element that will be used to initiate the drag
+     */
+    setDragElId: function(id) {
+        this.dragElId = id;
+    },
+
+    /**
+     * Allows you to specify a child of the linked element that should be
+     * used to initiate the drag operation.  An example of this would be if
+     * you have a content div with text and links.  Clicking anywhere in the
+     * content area would normally start the drag operation.  Use this method
+     * to specify that an element inside of the content div is the element
+     * that starts the drag operation.
+     *
+     * @param id the id of the element that will be used to initiate the drag
+     */
+    setHandleElId: function(id) {
+        this.handleElId = id;
+        this.DDM.regHandle(this.id, id);
+    },
+
+    /**
+     * Allows you to set an element outside of the linked element as a drag
+     * handle
+     */
+    setOuterHandleElId: function(id) {
+        this.logger.debug("Adding outer handle event: " + id);
+        YAHOO.util.Event.addListener(id, "mousedown",
+                this.handleMouseDown, this, true);
+        this.setHandleElId(id);
+    },
+
+    /**
+     * Remove all drag and drop hooks for this element
+     */
+    unreg: function() {
+        this.logger.debug("DragDrop obj cleanup " + this.id);
+        YAHOO.util.Event.removeListener(this.id, "mousedown",
+                this.handleMouseDown);
+        this._domRef = null;
+        this.DDM._remove(this);
+    },
+
+    /**
+     * Returns true if this instance is locked, or the drag drop mgr is locked
+     * (meaning that all drag/drop is disabled on the page.)
+     *
+     * @return {boolean} true if this obj or all drag/drop is locked, else
+     * false
+     */
+    isLocked: function() {
+        return (this.DDM.isLocked() || this.locked);
+    },
+
+    /**
+     * Fired when this object is clicked
+     *
+     * @param {Event} e
+     * @param {YAHOO.util.DragDrop} oDD the clicked dd object (this dd obj)
+     * @private
+     */
+    handleMouseDown: function(e, oDD) {
+
+        this.logger.debug("isLocked: " + this.isLocked());
+
+        var EU = YAHOO.util.Event;
+
+
+        var button = e.which || e.button;
+        this.logger.debug("button: " + button);
+
+        if (this.primaryButtonOnly && button > 1) {
+            this.logger.debug("Mousedown was not produced by the primary button");
+            return;
+        }
+
+        if (this.isLocked()) {
+            this.logger.debug("Drag and drop is disabled, aborting");
+            return;
+        }
+
+        this.logger.debug("mousedown " + this.id);
+
+        this.DDM.refreshCache(this.groups);
+
+        // Only process the event if we really clicked within the linked
+        // element.  The reason we make this check is that in the case that
+        // another element was moved between the clicked element and the
+        // cursor in the time between the mousedown and mouseup events. When
+        // this happens, the element gets the next mousedown event
+        // regardless of where on the screen it happened.
+        var pt = new YAHOO.util.Point(EU.getPageX(e), EU.getPageY(e));
+        if ( this.DDM.isOverTarget(pt, this) )  {
+
+            this.logger.debug("click is legit");
+
+            //  check to see if the handle was clicked
+            var srcEl = EU.getTarget(e);
+
+            if (this.isValidHandleChild(srcEl) &&
+                    (this.id == this.handleElId ||
+                     this.DDM.handleWasClicked(srcEl, this.id)) ) {
+
+                // set the initial element position
+                this.setStartPosition();
+
+                this.logger.debug("firing onMouseDown events");
+
+
+                this.b4MouseDown(e);
+                this.onMouseDown(e);
+                this.DDM.handleMouseDown(e, this);
+
+                this.DDM.stopEvent(e);
+            }
+        }
+    },
+
+    /**
+     * Allows you to specify a tag name that should not start a drag operation
+     * when clicked.  This is designed to facilitate embedding links within a
+     * drag handle that do something other than start the drag.
+     *
+     * @param {string} tagName the type of element to exclude
+     */
+    addInvalidHandleType: function(tagName) {
+        var type = tagName.toUpperCase();
+        this.invalidHandleTypes[type] = type;
+    },
+
+    /**
+     * Unsets an excluded tag name set by addInvalidHandleType
+     *
+     * @param {string} tagName the type of element to unexclude
+     */
+    removeInvalidHandleType: function(tagName) {
+        var type = tagName.toUpperCase();
+        this.invalidHandleTypes[type] = null;
+    },
+
+    /**
+     * Checks the tag exclusion list to see if this click should be ignored
+     *
+     * @param {ygNode} node
+     * @return {boolean} true if this is a valid tag type, false if not
+     */
+    isValidHandleChild: function(node) {
+        var type = node.nodeName;
+
+        if (type == "#text") {
+            // this.logger.debug("text node, getting parent node type");
+            type = node.parentNode.nodeName;
+        }
+
+        return (!this.invalidHandleTypes[type]);
+    },
+
+    /**
+     * Create the array of horizontal tick marks if an interval was specified
+     * in setXConstraint().
+     *
+     * @private
+     */
+    setXTicks: function(iStartX, iTickSize) {
+        this.xTicks = [];
+        this.xTickSize = iTickSize;
+
+        var tickMap = {};
+
+        for (var i = this.initPageX; i >= this.minX; i = i - iTickSize) {
+            if (!tickMap[i]) {
+                this.xTicks[this.xTicks.length] = i;
+                tickMap[i] = true;
+            }
+        }
+
+        for (i = this.initPageX; i <= this.maxX; i = i + iTickSize) {
+            if (!tickMap[i]) {
+                this.xTicks[this.xTicks.length] = i;
+                tickMap[i] = true;
+            }
+        }
+
+        this.xTicks.sort(this.DDM.numericSort) ;
+        this.logger.debug("xTicks: " + this.xTicks.join());
+    },
+
+    /**
+     * Create the array of vertical tick marks if an interval was specified in
+     * setYConstraint().
+     *
+     * @private
+     */
+    setYTicks: function(iStartY, iTickSize) {
+        this.yTicks = [];
+        this.yTickSize = iTickSize;
+
+        var tickMap = {};
+
+        for (var i = this.initPageY; i >= this.minY; i = i - iTickSize) {
+            if (!tickMap[i]) {
+                this.yTicks[this.yTicks.length] = i;
+                tickMap[i] = true;
+            }
+        }
+
+        for (i = this.initPageY; i <= this.maxY; i = i + iTickSize) {
+            if (!tickMap[i]) {
+                this.yTicks[this.yTicks.length] = i;
+                tickMap[i] = true;
+            }
+        }
+
+        this.yTicks.sort(this.DDM.numericSort) ;
+        this.logger.debug("yTicks: " + this.yTicks.join());
+    },
+
+    /**
+     * By default, the element can be dragged any place on the screen.  Use
+     * this method to limit the horizontal travel of the element.  Pass in
+     * 0,0 for the parameters if you want to lock the drag to the y axis.
+     *
+     * @param {int} iLeft the number of pixels the element can move to the left
+     * @param {int} iRight the number of pixels the element can move to the
+     * right
+     * @param {int} iTickSize optional parameter for specifying that the
+     * element
+     * should move iTickSize pixels at a time.
+     */
+    setXConstraint: function(iLeft, iRight, iTickSize) {
+        this.leftConstraint = iLeft;
+        this.rightConstraint = iRight;
+
+        this.minX = this.initPageX - iLeft;
+        this.maxX = this.initPageX + iRight;
+        if (iTickSize) { this.setXTicks(this.initPageX, iTickSize); }
+
+        this.constrainX = true;
+        this.logger.debug("initPageX:" + this.initPageX + " minX:" + this.minX +
+                " maxX:" + this.maxX);
+    },
+
+    /**
+     * By default, the element can be dragged any place on the screen.  Set
+     * this to limit the vertical travel of the element.  Pass in 0,0 for the
+     * parameters if you want to lock the drag to the x axis.
+     *
+     * @param {int} iUp the number of pixels the element can move up
+     * @param {int} iDown the number of pixels the element can move down
+     * @param {int} iTickSize optional parameter for specifying that the
+     * element should move iTickSize pixels at a time.
+     */
+    setYConstraint: function(iUp, iDown, iTickSize) {
+        this.topConstraint = iUp;
+        this.bottomConstraint = iDown;
+
+        this.minY = this.initPageY - iUp;
+        this.maxY = this.initPageY + iDown;
+        if (iTickSize) { this.setYTicks(this.initPageY, iTickSize); }
+
+        this.constrainY = true;
+
+        this.logger.debug("initPageY:" + this.initPageY + " minY:" + this.minY +
+                " maxY:" + this.maxY);
+    },
+
+    /**
+     * resetConstraints must be called if you manually reposition a dd element.
+     * @param {boolean} maintainOffset
+     */
+    resetConstraints: function() {
+
+        // this.logger.debug("init pagexy: " + this.initPageX + ", " +
+        //      this.initPageY);
+        // this.logger.debug("last pagexy: " + this.lastPageX + ", " +
+        //      this.lastPageY);
+
+        // figure out how much this thing has moved
+        var dx = (this.maintainOffset) ? this.lastPageX - this.initPageX : 0;
+        var dy = (this.maintainOffset) ? this.lastPageY - this.initPageY : 0;
+
+        // this.logger.debug("diff: " + dx + ", " + dy);
+
+        // reset the initial location
+        this.setInitPosition(dx, dy);
+
+        if (this.constrainX) {
+            this.setXConstraint( this.leftConstraint,
+                                 this.rightConstraint,
+                                 this.xTickSize        );
+        }
+
+        if (this.constrainY) {
+            this.setYConstraint( this.topConstraint,
+                                 this.bottomConstraint,
+                                 this.yTickSize         );
+        }
+    },
+
+    /**
+     * Normally the drag element is moved pixel by pixel, but we can specify
+     * that it move a number of pixels at a time.  This method resolves the
+     * location when we have it set up like this.
+     *
+     * @param {int} val where we want to place the object
+     * @param {int[]} tickArray sorted array of valid points
+     * @return {int} the closest tick
+     * @private
+     */
+    getTick: function(val, tickArray) {
+
+        if (!tickArray) {
+            // If tick interval is not defined, it is effectively 1 pixel,
+            // so we return the value passed to us.
+            return val;
+        } else if (tickArray[0] >= val) {
+            // The value is lower than the first tick, so we return the first
+            // tick.
+            return tickArray[0];
+        } else {
+            for (var i = 0; i < tickArray.length; ++i) {
+                var next = i + 1;
+                if (tickArray[next] && tickArray[next] >= val) {
+                    var diff1 = val - tickArray[i];
+                    var diff2 = tickArray[next] - val;
+                    return (diff2 > diff1) ? tickArray[i] : tickArray[next];
+                }
+            }
+
+            // The value is larger than the last tick, so we return the last
+            // tick.
+            return tickArray[tickArray.length - 1];
+        }
+    },
+
+    /**
+     * toString method
+     * @return {string} string representation of the dd obj
+     */
+    toString: function(val, tickArray) {
+        return ("YAHOO.util.DragDrop {" + this.id + "}");
+    }
+
+};
+
+/* Copyright (c) 2006 Yahoo! Inc. All rights reserved. */
+
+// Only load the library once.  Rewriting the manager class would orphan
+// existing drag and drop instances.
+if (!YAHOO.util.DragDropMgr) {
+
+    /**
+     * @class Handles the element interaction for all DragDrop items in the
+     * window.  Generally, you will not call this class directly, but it does
+     * have helper methods that could be useful in your DragDrop
+     * implementations.  This class should not be instantiated; all methods
+     * are are static.
+     *
+     * @constructor
+     */
+    YAHOO.util.DragDropMgr = new function() {
+
+        /**
+         * utility package shorthand
+         * @private
+         */
+        var UTIL = YAHOO.util;
+
+        /**
+         * Two dimensional Array of registered DragDrop objects.  The first
+         * dimension is the DragDrop item group, the second the DragDrop
+         * object.
+         *
+         * @private
+         */
+        this.ids = {};
+
+        /**
+         * Array of element ids defined as drag handles.  Used to determine
+         * if the element that generated the mousedown event is actually the
+         * handle and not the html element itself.
+         *
+         * @private
+         */
+        this.handleIds = {};
+
+        /**
+         * the DragDrop object that is currently being dragged
+         *
+         * @type DragDrop
+         * @private
+         **/
+        this.dragCurrent = null;
+
+        /**
+         * the DragDrop object(s) that are being hovered over
+         *
+         * @type Array
+         * @private
+         */
+        this.dragOvers = {};
+
+        /**
+         * @private
+         */
+        this.logger = null;
+
+        /**
+         * the X distance between the cursor and the object being dragged
+         *
+         * @type int
+         * @private
+         */
+        this.deltaX = 0;
+
+        /**
+         * the Y distance between the cursor and the object being dragged
+         *
+         * @type int
+         * @private
+         */
+        this.deltaY = 0;
+
+        /**
+         * Flag to determine if we should prevent the default behavior of the
+         * events we define. By default this is true, but this can be set to
+         * false if you need the default behavior (not recommended)
+         *
+         * @type boolean
+         */
+        this.preventDefault = true;
+
+        /**
+         * Flag to determine if we should stop the propagation of the events
+         * we generate. This is true by default but you may want to set it to
+         * false if the html element contains other features that require the
+         * mouse click.
+         *
+         * @type boolean
+         */
+        this.stopPropagation = true;
+
+        /**
+         * @private
+         */
+        this.initalized = false;
+
+        /**
+         * All drag and drop can be disabled.
+         *
+         * @private
+         */
+        this.locked = false;
+
+        /**
+         * Called the first time an element is registered.
+         *
+         * @private
+         */
+        this.init = function() {
+            this.logger = new ygLogger("DragDropMgr");
+        };
+
+        /**
+         * In point mode, drag and drop interaction is defined by the
+         * location of the cursor during the drag/drop
+         * @type int
+         */
+        this.POINT     = 0;
+
+        /**
+         * In intersect mode, drag and drop interactio nis defined by the
+         * overlap of two or more drag and drop objects.
+         * @type int
+         */
+        this.INTERSECT = 1;
+
+        /**
+         * The current drag and drop mode.  Default it point mode
+         * @type int
+         */
+        this.mode = this.POINT;
+
+        /**
+         * Runs method on all drag and drop objects
+         * @private
+         */
+        this._execOnAll = function(sMethod, args) {
+            for (var i in this.ids) {
+                for (var j in this.ids[i]) {
+                    var oDD = this.ids[i][j];
+                    if (! this.isTypeOfDD(oDD)) {
+                        continue;
+                    }
+                    oDD[sMethod].apply(oDD, args);
+                }
+            }
+        };
+
+        /**
+         * Drag and drop initialization.  Sets up the global event handlers
+         * @private
+         */
+        this._onLoad = function() {
+
+            this._execOnAll("setInitPosition", []);
+
+            this.logger = new ygLogger("DragDropMgr");
+            this.logger.debug("DDM onload");
+
+            var EU = UTIL.Event;
+
+            EU.addListener(document, "mouseup",   this.handleMouseUp, this, true);
+            EU.addListener(document, "mousemove", this.handleMouseMove, this, true);
+            EU.addListener(window,   "unload",    this._onUnload, this, true);
+            EU.addListener(window,   "resize",    this._onResize, this, true);
+            // EU.addListener(window,   "mouseout",    this._test);
+
+            this.initalized = true;
+
+        };
+
+        /**
+         * Reset constraints on all drag and drop objs
+         * @private
+         */
+        this._onResize = function(e) {
+            this.logger.debug("window resize");
+            this._execOnAll("resetConstraints", []);
+        };
+
+        /**
+         * Lock all drag and drop functionality
+         */
+        this.lock = function() { this.locked = true; };
+
+        /**
+         * Unlock all drag and drop functionality
+         */
+        this.unlock = function() { this.locked = false; };
+
+        /**
+         * Is drag and drop locked?
+         *
+         * @return {boolean} True if drag and drop is locked, false otherwise.
+         */
+        this.isLocked = function() { return this.locked; };
+
+        /**
+         * Location cache that is set for all drag drop objects when a drag is
+         * initiated, cleared when the drag is finished.
+         *
+         * @private
+         */
+        this.locationCache = {};
+
+        /**
+         * Set useCache to false if you want to force object the lookup of each
+         * drag and drop linked element constantly during a drag.
+         * @type boolean
+         */
+        this.useCache = true;
+
+        /**
+         * The number of pixels that the mouse needs to move after the
+         * mousedown before the drag is initiated.  Default=3;
+         * @type int
+         */
+        this.clickPixelThresh = 3;
+
+        /**
+         * The number of milliseconds after the mousedown event to initiate the
+         * drag if we don't get a mouseup event. Default=1000
+         * @type int
+         */
+        this.clickTimeThresh = 1000;
+
+        /**
+         * Flag that indicates that either the drag pixel threshold or the
+         * mousdown time threshold has been met
+         * @type boolean
+         * @private
+         */
+        this.dragThreshMet = false;
+
+        /**
+         * Timeout used for the click time threshold
+         * @type Object
+         * @private
+         */
+        this.clickTimeout = null;
+
+        /**
+         * The X position of the mousedown event stored for later use when a
+         * drag threshold is met.
+         * @type int
+         * @private
+         */
+        this.startX = 0;
+
+        /**
+         * The Y position of the mousedown event stored for later use when a
+         * drag threshold is met.
+         * @type int
+         * @private
+         */
+        this.startY = 0;
+
+        /**
+         * Each DragDrop instance must be registered with the DragDropMgr.
+         * This is executed in ygDragDrop.init()
+         *
+         * @param {DragDrop} oDD the DragDrop object to register
+         * @param {String} sGroup the name of the group this element belongs to
+         */
+        this.regDragDrop = function(oDD, sGroup) {
+            if (!this.initialized) { this.init(); }
+
+            if (!this.ids[sGroup]) {
+                this.ids[sGroup] = {};
+            }
+            this.ids[sGroup][oDD.id] = oDD;
+        };
+
+        /**
+         * Unregisters a drag and drop item.  This is executed in
+         * ygDragDrop.unreg, use that method instead of calling this directly.
+         * @private
+         */
+        this._remove = function(oDD) {
+            for (var g in oDD.groups) {
+                if (g && this.ids[g][oDD.id]) {
+                    delete this.ids[g][oDD.id];
+                }
+            }
+            delete this.handleIds[oDD.id];
+        };
+
+        /**
+         * Each DragDrop handle element must be registered.  This is done
+         * automatically when executing ygDragDrop.setHandleElId()
+         *
+         * @param {String} sDDId the DragDrop id this element is a handle for
+         * @param {String} sHandleId the id of the element that is the drag
+         * handle
+         */
+        this.regHandle = function(sDDId, sHandleId) {
+            if (!this.handleIds[sDDId]) {
+                this.handleIds[sDDId] = {};
+            }
+            this.handleIds[sDDId][sHandleId] = sHandleId;
+        };
+
+        /**
+         * Utility function to determine if a given element has been
+         * registered as a drag drop item.
+         *
+         * @param {String} id the element id to check
+         * @return {boolean} true if this element is a DragDrop item,
+         * false otherwise
+         */
+        this.isDragDrop = function(id) {
+            return ( this.getDDById(id) ) ? true : false;
+        };
+
+        /**
+         * Returns the drag and drop instances that are in all groups the
+         * passed in instance belongs to.
+         *
+         * @param {ygDragDrop} p_oDD the obj to get related data for
+         * @param {boolean} bTargetsOnly if true, only return targetable objs
+         * @return {ygDragDrop[]} the related instances
+         */
+        this.getRelated = function(p_oDD, bTargetsOnly) {
+            var oDDs = [];
+            for (var i in p_oDD.groups) {
+                for (j in this.ids[i]) {
+                    var dd = this.ids[i][j];
+                    if (! this.isTypeOfDD(dd)) {
+                        continue;
+                    }
+                    if (!bTargetsOnly || dd.isTarget) {
+                        oDDs[oDDs.length] = dd;
+                    }
+                }
+            }
+
+            return oDDs;
+        };
+
+        /**
+         * Returns true if the specified dd target is a legal target for
+         * the specifice drag obj
+         *
+         * @param {ygDragDrop} the drag obj
+         * @param {ygDragDrop) the target
+         * @return {boolean} true if the target is a legal target for the
+         * dd obj
+         */
+        this.isLegalTarget = function (oDD, oTargetDD) {
+            var targets = this.getRelated(oDD);
+            for (var i =0;i<targets.length;++i) {
+                if (targets[i].id == oTargetDD.id) {
+                    return true;
+                }
+            }
+
+            return false;
+        };
+
+        /**
+         * My goal is to be able to transparently determine if an object is
+         * typeof ygDragDrop, and the exact subclass of ygDragDrop.  typeof
+         * returns "object", oDD.constructor.toString() always returns
+         * "ygDragDrop" and not the name of the subclass.  So for now it just
+         * evaluates a well-known variable in ygDragDrop.
+         *
+         * @param {Object} the object to evaluate
+         * @return {boolean} true if typeof oDD = ygDragDrop
+         */
+        this.isTypeOfDD = function (oDD) {
+            return (oDD && oDD.__ygDragDrop);
+        };
+
+        /**
+         * Utility function to determine if a given element has been
+         * registered as a drag drop handle for the given Drag Drop object.
+         *
+         * @param {String} id the element id to check
+         * @return {boolean} true if this element is a DragDrop handle, false
+         * otherwise
+         */
+        this.isHandle = function(sDDId, sHandleId) {
+            return ( this.handleIds[sDDId] &&
+                            this.handleIds[sDDId][sHandleId] );
+        };
+
+        /**
+         * Returns the DragDrop instance for a given id
+         *
+         * @param {String} id the id of the DragDrop object
+         * @return {DragDrop} the drag drop object, null if it is not found
+         */
+        this.getDDById = function(id) {
+            for (var i in this.ids) {
+                if (this.ids[i][id]) {
+                    return this.ids[i][id];
+                }
+            }
+            return null;
+        };
+
+        /**
+         * Fired after a registered DragDrop object gets the mousedown event.
+         * Sets up the events required to track the object being dragged
+         *
+         * @param {Event} e the event
+         * @param oDD the DragDrop object being dragged
+         * @private
+         */
+        this.handleMouseDown = function(e, oDD) {
+            this.logger.debug("mousedown - adding event handlers");
+            this.dragCurrent = oDD;
+
+            var el = oDD.getEl();
+
+            // track start position
+            this.startX = UTIL.Event.getPageX(e);
+            this.startY = UTIL.Event.getPageY(e);
+
+            this.deltaX = this.startX - el.offsetLeft;
+            this.deltaY = this.startY - el.offsetTop;
+
+            this.dragThreshMet = false;
+
+            this.clickTimeout = setTimeout(
+               "var DDM=YAHOO.util.DDM;DDM.startDrag(DDM.startX, DDM.startY)",
+               this.clickTimeThresh );
+        };
+
+        /**
+         * Fired when either the drag pixel threshol or the mousedown hold
+         * time threshold has been met.
+         *
+         * @param x {int} the X position of the original mousedown
+         * @param y {int} the Y position of the original mousedown
+         */
+        this.startDrag = function(x, y) {
+            this.logger.debug("firing drag start events");
+            clearTimeout(this.clickTimeout);
+            if (this.dragCurrent) {
+                this.dragCurrent.b4StartDrag(x, y);
+                this.dragCurrent.startDrag(x, y);
+            }
+            this.dragThreshMet = true;
+        };
+
+        /**
+         * Internal function to handle the mouseup event.  Will be invoked
+         * from the context of the document.
+         *
+         * @param {Event} e the event
+         * @private
+         */
+        this.handleMouseUp = function(e) {
+
+            if (! this.dragCurrent) {
+                return;
+            }
+
+            clearTimeout(this.clickTimeout);
+
+            if (this.dragThreshMet) {
+                this.logger.debug("mouseup detected - completing drag");
+                this.fireEvents(e, true);
+            } else {
+                this.logger.debug("drag threshold not met");
+            }
+
+            this.stopDrag(e);
+
+            this.stopEvent(e);
+        };
+
+        /**
+         * Utility to stop event propagation and event default, if these
+         * features are turned on.
+         *
+         * @param {Event} e the event as returned by this.getEvent()
+         */
+        this.stopEvent = function(e) {
+            if (this.stopPropagation) {
+                UTIL.Event.stopPropagation(e);
+            }
+
+            if (this.preventDefault) {
+                UTIL.Event.preventDefault(e);
+            }
+        };
+
+        /**
+         * Internal function to clean up event handlers after the drag
+         * operation is complete
+         *
+         * @param {Event} e the event
+         * @private
+         */
+        this.stopDrag = function(e) {
+            // this.logger.debug("mouseup - removing event handlers");
+
+            // Fire the drag end event for the item that was dragged
+            if (this.dragCurrent) {
+                if (this.dragThreshMet) {
+                    this.logger.debug("firing endDrag events");
+                    this.dragCurrent.b4EndDrag(e);
+                    this.dragCurrent.endDrag(e);
+                }
+
+                this.logger.debug("firing onMouseUp event");
+                this.dragCurrent.onMouseUp(e);
+            }
+
+            this.dragCurrent = null;
+            this.dragOvers = {};
+        };
+
+
+        /**
+         * Internal function to handle the mousemove event.  Will be invoked
+         * from the context of the html element.
+         *
+         * @TODO figure out what we can do about mouse events lost when the
+         * user drags objects beyond the window boundary.  Currently we can
+         * detect this in internet explorer by verifying that the mouse is
+         * down during the mousemove event.  Firefox doesn't give us the
+         * button state on the mousemove event.
+         *
+         * @param {Event} e the event
+         * @private
+         */
+        this.handleMouseMove = function(e) {
+            if (! this.dragCurrent) {
+                // this.logger.debug("no current drag obj");
+                return;
+            }
+
+            // var button = e.which || e.button;
+
+            this.logger.debug("which: " + e.which + ", button: "+ e.button);
+
+
+            // check for IE mouseup outside of page boundary
+            if (UTIL.Event.isIE && !e.button) {
+                this.stopEvent(e);
+                return this.handleMouseUp(e);
+                // this.logger.debug("button failure");
+            }
+
+            if (!this.dragThreshMet) {
+                var diffX = Math.abs(this.startX - UTIL.Event.getPageX(e));
+                var diffY = Math.abs(this.startY - UTIL.Event.getPageY(e));
+                // this.logger.debug("diffX: " + diffX + "diffY: " + diffY);
+                if (diffX > this.clickPixelThresh ||
+                            diffY > this.clickPixelThresh) {
+                    this.logger.debug("pixel threshold met");
+                    this.startDrag(this.startX, this.startY);
+                }
+            }
+
+            if (this.dragThreshMet) {
+                this.dragCurrent.b4Drag(e);
+                this.dragCurrent.onDrag(e);
+                this.fireEvents(e, false);
+            }
+
+            this.stopEvent(e);
+        };
+
+        /**
+         * Iterates over all of the DragDrop elements to find ones we are
+         * hovering over or dropping on
+         *
+         * @param {Event} e the event
+         * @param {boolean} isDrop is this a drop op or a mouseover op?
+         * @private
+         */
+        this.fireEvents = function(e, isDrop) {
+            var dc = this.dragCurrent;
+
+            // If the user did the mouse up outside of the window, we could
+            // get here even though we have ended the drag.
+            if (!dc || dc.isLocked()) {
+                return;
+            }
+
+            var x = UTIL.Event.getPageX(e);
+            var y = UTIL.Event.getPageY(e);
+            var pt = new YAHOO.util.Point(x,y);
+
+            // cache the previous dragOver array
+            var oldOvers = [];
+
+            var outEvts   = [];
+            var overEvts  = [];
+            var dropEvts  = [];
+            var enterEvts = [];
+
+            // Check to see if the object we were hovering over is no longer
+            // being hovered over so we can fire the onDragOut event
+            for (var i in this.dragOvers) {
+
+                var ddo = this.dragOvers[i];
+
+                if (! this.isTypeOfDD(ddo)) {
+                    continue;
+                }
+
+                if (! this.isOverTarget(pt, ddo, this.mode)) {
+                    outEvts.push( ddo );
+                }
+
+                oldOvers[i] = true;
+                delete this.dragOvers[i];
+            }
+
+            for (var sGroup in dc.groups) {
+                // this.logger.debug("Processing group " + sGroup);
+
+                if ("string" != typeof sGroup) {
+                    continue;
+                }
+
+                for (i in this.ids[sGroup]) {
+                    var oDD = this.ids[sGroup][i];
+                    if (! this.isTypeOfDD(oDD)) {
+                        continue;
+                    }
+
+                    if (oDD.isTarget && !oDD.isLocked() && oDD != dc) {
+                        if (this.isOverTarget(pt, oDD, this.mode)) {
+                            // look for drop interactions
+                            if (isDrop) {
+                                dropEvts.push( oDD );
+                            // look for drag enter and drag over interactions
+                            } else {
+
+                                // initial drag over: dragEnter fires
+                                if (!oldOvers[oDD.id]) {
+                                    enterEvts.push( oDD );
+                                // subsequent drag overs: dragOver fires
+                                } else {
+                                    overEvts.push( oDD );
+                                }
+
+                                this.dragOvers[oDD.id] = oDD;
+                            }
+                        }
+                    }
+                }
+            }
+
+            if (this.mode) {
+                if (outEvts.length > 0) {
+                    dc.b4DragOut(e, outEvts);
+                    dc.onDragOut(e, outEvts);
+                }
+
+                if (enterEvts.length > 0) {
+                    dc.onDragEnter(e, enterEvts);
+                }
+
+                if (overEvts.length > 0) {
+                    dc.b4DragOver(e, overEvts);
+                    dc.onDragOver(e, overEvts);
+                }
+
+                if (dropEvts.length > 0) {
+                    dc.b4DragDrop(e, dropEvts);
+                    dc.onDragDrop(e, dropEvts);
+                }
+
+            } else {
+                // fire dragout events
+                for (i=0; i < outEvts.length; ++i) {
+                    this.logger.debug(dc.id+" onDragOut: " + outEvts[i].id);
+                    dc.b4DragOut(e, outEvts[i].id);
+                    dc.onDragOut(e, outEvts[i].id);
+                }
+
+                // fire enter events
+                for (i=0; i < enterEvts.length; ++i) {
+                    this.logger.debug(dc.id + " dragEnter " + enterEvts[i].id);
+                    // dc.b4DragEnter(e, oDD.id);
+                    dc.onDragEnter(e, enterEvts[i].id);
+                }
+
+                // fire over events
+                for (i=0; i < overEvts.length; ++i) {
+                    this.logger.debug(dc.id + " dragOver " + overEvts[i].id);
+                    dc.b4DragOver(e, overEvts[i].id);
+                    dc.onDragOver(e, overEvts[i].id);
+                }
+
+                // fire drop events
+                for (i=0; i < dropEvts.length; ++i) {
+                    this.logger.debug(dc.id + " dragDrop " + dropEvts[i].id);
+                    dc.b4DragDrop(e, dropEvts[i].id);
+                    dc.onDragDrop(e, dropEvts[i].id);
+                }
+
+            }
+
+        };
+
+        /**
+         * Helper function for getting the best match from the list of drag
+         * and drop objects returned by the drag and drop events when we are
+         * in INTERSECT mode.  It returns either the first object that the
+         * cursor is over, or the object that has the greatest overlap with
+         * the dragged element.
+         *
+         * @param  {ygDragDrop[]} dds The array of drag and drop objects
+         * targeted
+         * @return {ygDragDrop}       The best single match
+         */
+        this.getBestMatch = function(dds) {
+            var winner = null;
+            // Return null if the input is not what we expect
+            //if (!dds || !dds.length || dds.length == 0) {
+               // winner = null;
+            // If there is only one item, it wins
+            //} else if (dds.length == 1) {
+
+            if (dds.length == 1) {
+                winner = dds[0];
+            } else {
+                // Loop through the targeted items
+                for (var i=0; i<dds.length; ++i) {
+                    var dd = dds[i];
+                    // If the cursor is over the object, it wins.  If the
+                    // cursor is over multiple matches, the first one we come
+                    // to wins.
+                    if (dd.cursorIsOver) {
+                        winner = dd;
+                        break;
+                    // Otherwise the object with the most overlap wins
+                    } else {
+                        if (!winner ||
+                            winner.overlap.getArea() < dd.overlap.getArea()) {
+                            winner = dd;
+                        }
+                    }
+                }
+            }
+
+            return winner;
+        };
+
+        /**
+         * Refreshes the cache of the top-left and bottom-right points of the
+         * drag and drop objects in the specified groups
+         *
+         * @param {Array} aGroups an associative array of groups to refresh
+         */
+        this.refreshCache = function(aGroups) {
+            this.logger.debug("refreshing element location cache");
+            for (sGroup in aGroups) {
+                if ("string" != typeof sGroup) {
+                    continue;
+                }
+                for (i in this.ids[sGroup]) {
+                    var oDD = this.ids[sGroup][i];
+
+                    if (this.isTypeOfDD(oDD)) {
+                        var loc = this.getLocation(oDD);
+                        if (loc) {
+                            this.locationCache[oDD.id] = loc;
+                        } else {
+                            delete this.locationCache[oDD.id];
+                            this.logger.debug("something is wrong with the element");
+                            // this will unregister the drag and drop object if
+                            // the element is not in a usable state
+                            oDD.unreg();
+                        }
+                    }
+                }
+            }
+        };
+
+        /**
+         * This checks to make sure an element exists and is in the DOM.  The
+         * main purpose is to handle cases where innerHTML is used to remove
+         * drag and drop objects from the DOM.  IE provides an 'unspecified
+         * error' when trying to access the offsetParent of such an element
+         * @param {HTMLElement} el the element to check
+         * @return {boolean} true if the element looks usable
+         */
+        this.verifyEl = function(el) {
+            try {
+                if (el) {
+                    var parent = el.offsetParent;
+                    if (parent) {
+                        return true;
+                    }
+                }
+            } catch(e) {
+                this.logger.debug("detected problem with an element");
+            }
+
+            return false;
+        };
+
+        /**
+         * Returns the an array containing the drag and drop element's position
+         * and size, including the ygDragDrop.padding configured for it
+         *
+         * @param {ygDragDrop} oDD the drag and drop object to get the
+         * location for
+         * @return array containing the top left and bottom right points of the
+         * element
+         */
+        this.getLocation = function(oDD) {
+            if (! this.isTypeOfDD(oDD)) {
+                this.logger.debug(oDD + " is not a DD obj");
+                return null;
+            }
+
+            var el = oDD.getEl();
+
+            if (!this.verifyEl(el)) {
+                this.logger.debug(oDD + " element is not usable");
+                return null;
+            }
+
+            // this.logger.debug(oDD.id + " padding: " + oDD.padding);
+
+            // var aPos = ygPos.getPos(el);
+            var aPos = YAHOO.util.Dom.getXY(el);
+
+            x1 = aPos[0];
+            x2 = x1 + el.offsetWidth;
+
+            y1 = aPos[1];
+            y2 = y1 + el.offsetHeight;
+
+            var t = y1 - oDD.padding[0];
+            var r = x2 + oDD.padding[1];
+            var b = y2 + oDD.padding[2];
+            var l = x1 - oDD.padding[3];
+
+            return new YAHOO.util.Region( t, r, b, l );
+
+        };
+
+        /**
+         * Checks the cursor location to see if it over the target
+         *
+         * @param {YAHOO.util.Point} pt The point to evaluate
+         * @param {ygDragDrop} oDDTarget the DragDrop object we are inspecting
+         * @return {boolean} true if the mouse is over the target
+         * @private
+         */
+        this.isOverTarget = function(pt, oDDTarget, intersect) {
+            // use cache if available
+            var loc = this.locationCache[oDDTarget.id];
+            if (!loc || !this.useCache) {
+                this.logger.debug("cache not populated");
+                loc = this.getLocation(oDDTarget);
+                this.locationCache[oDDTarget.id] = loc;
+
+                this.logger.debug("cache: " + loc);
+            }
+
+            // this.logger.debug("isOverTarget: " + x + "," + y + ", " + loc);
+
+            // var cursorIsOver =  (x >= loc[3] && x <= loc[1] && y >= loc[0] && y <= loc[2]);
+            //oDDTarget.cursorIsOver = loc.contains( new YAHOO.util.Point(x, y) );
+            oDDTarget.cursorIsOver = loc.contains( pt );
+            oDDTarget.overlap = null;
+
+            // if (this.INTERSECT == this.mode) {
+            if (intersect) {
+
+                var curRegion =
+                    YAHOO.util.Region.getRegion(this.dragCurrent.getDragEl());
+                var overlap = curRegion.intersect(loc);
+
+                if (overlap) {
+                    oDDTarget.overlap = overlap;
+                    return true;
+                } else {
+                    return false;
+                }
+
+            } else {
+                return oDDTarget.cursorIsOver;
+            }
+        };
+
+        /**
+         * @private
+         */
+        this._onUnload = function(e, me) {
+            this.unregAll();
+        };
+
+        /**
+         * Cleans up the drag and drop events and objects.
+         *
+         * @private
+         */
+        this.unregAll = function() {
+            this.logger.debug("unregister all");
+
+            if (this.dragCurrent) {
+                this.stopDrag();
+                this.dragCurrent = null;
+            }
+
+            this._execOnAll("unreg", []);
+
+            for (i in this.elementCache) {
+                delete this.elementCache[i];
+            }
+
+            this.elementCache = {};
+            this.ids = {};
+        };
+
+        /**
+         * A cache of DOM elements
+         *
+         * @private
+         */
+        this.elementCache = {};
+
+        /**
+         * Get the wrapper for the DOM element specified
+         *
+         * @param {String} id the id of the elment to get
+         * @return {YAHOO.util.DDM.ElementWrapper} the wrapped element
+         * @private
+         */
+        this.getElWrapper = function(id) {
+            var oWrapper = this.elementCache[id];
+            if (!oWrapper || !oWrapper.el) {
+                // this.logger.debug("adding element cache: " + id);
+                oWrapper = this.elementCache[id] =
+                    new this.ElementWrapper(document.getElementById(id));
+            }
+            return oWrapper;
+        };
+
+        /**
+         * Returns the actual DOM element
+         *
+         * @param {String} id the id of the elment to get
+         * @return {Object} The element
+         */
+        this.getElement = function(id) {
+            // return this.getElWrapper(id).el;
+            return document.getElementById(id);
+        };
+
+        /**
+         * Returns the style property for the DOM element (i.e.,
+         * document.getElById(id).style)
+         *
+         * @param {String} id the id of the elment to get
+         * @return {Object} The style property of the element
+         */
+        this.getCss = function(id) {
+            // return this.getElWrapper(id).css;
+            var css = null;
+            var el = document.getElementById(id);
+            if (el) {
+                css = el.style;
+            }
+
+            return css;
+        };
+
+        /**
+         * Inner class for cached elements
+         */
+        this.ElementWrapper = function(el) {
+                /**
+                 * @private
+                 */
+                this.el = el || null;
+                /**
+                 * @private
+                 */
+                this.id = this.el && el.id;
+                /**
+                 * @private
+                 */
+                this.css = this.el && el.style;
+            };
+
+        /**
+         * Returns the X position of an html element
+         * @param el the element for which to get the position
+         * @return {int} the X coordinate
+         */
+        this.getPosX = function(el) {
+            return YAHOO.util.Dom.getX(el);
+        };
+
+        /**
+         * Returns the Y position of an html element
+         * @param el the element for which to get the position
+         * @return {int} the Y coordinate
+         */
+        this.getPosY = function(el) {
+            return YAHOO.util.Dom.getY(el);
+        };
+
+        /**
+         * Swap two nodes.  In IE, we use the native method, for others we
+         * emulate the IE behavior
+         *
+         * @param n1 the first node to swap
+         * @param n2 the other node to swap
+         */
+        this.swapNode = function(n1, n2) {
+            if (n1.swapNode) {
+                n1.swapNode(n2);
+            } else {
+                // the node reference order for the swap is a little tricky.
+                var p = n2.parentNode;
+                var s = n2.nextSibling;
+                n1.parentNode.replaceChild(n2,n1);
+                p.insertBefore(n1,s);
+            }
+        };
+
+        /**
+         * @private
+         */
+        this.getScroll = function () {
+            var t, l;
+            if (document.documentElement && document.documentElement.scrollTop) {
+                t = document.documentElement.scrollTop;
+                l = document.documentElement.scrollLeft;
+            } else if (document.body) {
+                t = document.body.scrollTop;
+                l = document.body.scrollLeft;
+            }
+            return { top: t, left: l };
+        };
+
+        /**
+         * Returns the specified element style property
+         * @param {HTMLElement} el          the element
+         * @param {string}      styleProp   the style property
+         * @return {string}     The value of the style property
+         */
+        this.getStyle = function(el, styleProp) {
+            if (el.style.styleProp) {
+                return el.style.styleProp;
+            } else if (el.currentStyle) {
+                return el.currentStyle[styleProp];
+            } else if (document.defaultView) {
+                return document.defaultView.getComputedStyle(el, null).
+                    getPropertyValue(styleProp);
+            }
+        };
+
+        /**
+         * Gets the scrollTop
+         *
+         * @return {int} the document's scrollTop
+         */
+        this.getScrollTop = function () { return this.getScroll().top; };
+
+        /**
+         * Gets the scrollLeft
+         *
+         * @return {int} the document's scrollTop
+         */
+        this.getScrollLeft = function () { return this.getScroll().left; };
+
+        this.moveToEl = function (moveEl, targetEl) {
+            var aCoord = YAHOO.util.Dom.getXY(targetEl);
+            this.logger.debug("moveToEl: " + aCoord);
+            YAHOO.util.Dom.setXY(moveEl, aCoord);
+        };
+
+        /**
+         * Gets the client height
+         *
+         * @return {int} client height in px
+         */
+        this.getClientHeight = function() {
+            return (window.innerHeight) ? window.innerHeight :
+                (document.documentElement && document.documentElement.clientHeight) ?
+                document.documentElement.clientHeight : document.body.offsetHeight;
+        };
+
+        /**
+         * Gets the client width
+         *
+         * @return {int} client width in px
+         */
+        this.getClientWidth = function() {
+            return (window.innerWidth) ? window.innerWidth :
+                (document.documentElement && document.documentElement.clientWidth) ?
+                document.documentElement.clientWidth : document.body.offsetWidth;
+        };
+
+        /**
+         * numeric array sort function
+         */
+        this.numericSort = function(a, b) { return (a - b); };
+
+        /**
+         * @private
+         */
+        this._timeoutCount = 0;
+
+        /**
+         * @private
+         * Trying to make the load order less important.  Without this we get
+         * an error if this file is loaded before the Event Utility.
+         */
+        this._addListeners = function() {
+            if ( UTIL.Event &&
+                 document          &&
+                 document.body        ) {
+
+                this._onLoad();
+            } else {
+                if (this._timeoutCount > 500) {
+                    this.logger.debug("DragDrop requires the Event Utility");
+                } else {
+                    setTimeout("YAHOO.util.DDM._addListeners()", 10);
+                    this._timeoutCount += 1;
+                }
+            }
+
+        };
+
+        /**
+         * Recursively searches the immediate parent and all child nodes for
+         * the handle element in order to determine wheter or not it was
+         * clicked.
+         *
+         * @param node the html element to inspect
+         */
+        this.handleWasClicked = function(node, id) {
+            if (this.isHandle(id, node.id)) {
+                this.logger.debug("clicked node is a handle");
+                return true;
+            } else {
+                // check to see if this is a text node child of the one we want
+                var p = node.parentNode;
+                // this.logger.debug("p: " + p);
+
+                while (p) {
+                    if (this.isHandle(id, p.id)) {
+                        return true;
+                    } else {
+                        this.logger.debug(p.id + " is not a handle");
+                        p = p.parentNode;
+                    }
+                }
+            }
+
+            return false;
+        };
+
+    };
+
+    // shorter alias, save a few bytes
+    YAHOO.util.DDM = YAHOO.util.DragDropMgr;
+    YAHOO.util.DDM._addListeners();
+
+}
+
+/* Copyright (c) 2006 Yahoo! Inc. All rights reserved. */
+
+/**
+ * @class a DragDrop implementation where the linked element follows the
+ * mouse cursor.
+ *
+ * @extends DragDrop
+ * @constructor
+ * @param {String} id the id of the linked element
+ * @param {String} sGroup the group of related DragDrop items
+ */
+YAHOO.util.DD = function(id, sGroup) {
+    if (id) {
+        this.init(id, sGroup);
+        this.logger.setModuleName("DD");
+    }
+};
+
+YAHOO.util.DD.prototype = new YAHOO.util.DragDrop();
+
+/**
+ * Should we auto-scroll? Defaults to true
+ *
+ * @type boolean
+ */
+YAHOO.util.DD.prototype.scroll = true;
+
+/**
+ * Sets the pointer offset to the distance between the linked element's top
+ * left corner and the location the element was clicked
+ *
+ * @param {int} iPageX the X coordinate of the click
+ * @param {int} iPageY the Y coordinate of the click
+ */
+YAHOO.util.DD.prototype.autoOffset = function(iPageX, iPageY) {
+    var el = this.getEl();
+    var aCoord = YAHOO.util.Dom.getXY(el);
+    var x = iPageX - aCoord[0];
+    var y = iPageY - aCoord[1];
+    this.setDelta(x, y);
+    this.logger.debug("autoOffset el pos: " + aCoord + ", delta: " + x + "," + y);
+};
+
+/**
+ * Sets the pointer offset.  You can call this directly to force the offset to
+ * be in a particular location (e.g., pass in 0,0 to set it to the center of the
+ * object, as done in ygDDSliderBG)
+ *
+ * @param {int} iDeltaX the distance from the left
+ * @param {int} iDeltaY the distance from the top
+ */
+YAHOO.util.DD.prototype.setDelta = function(iDeltaX, iDeltaY) {
+    this.deltaX = iDeltaX;
+    this.deltaY = iDeltaY;
+    this.logger.debug("deltaX:" + this.deltaX + ", deltaY:" + this.deltaY);
+};
+
+/**
+ * Sets the drag element to the location of the mousedown or click event,
+ * maintaining the cursor location relative to the location on the element
+ * that was clicked.  Override this if you want to place the element in a
+ * location other than where the cursor is.
+ *
+ * @param {int} iPageX the X coordinate of the mousedown or drag event
+ * @param {int} iPageY the Y coordinate of the mousedown or drag event
+ */
+
+YAHOO.util.DD.prototype.setDragElPos = function(iPageX, iPageY) {
+    this.alignElWithMouse(this.getDragEl(), iPageX, iPageY);
+};
+
+/**
+ * Sets the element to the location of the mousedown or click event,
+ * maintaining the cursor location relative to the location on the element
+ * that was clicked.  Override this if you want to place the element in a
+ * location other than where the cursor is.
+ *
+ * @param {HTMLElement} el the element to move
+ * @param {int} iPageX the X coordinate of the mousedown or drag event
+ * @param {int} iPageY the Y coordinate of the mousedown or drag event
+ */
+YAHOO.util.DD.prototype.alignElWithMouse = function(el, iPageX, iPageY) {
+    var oCoord = this.getTargetCoord(iPageX, iPageY);
+    var aCoord = [oCoord.x, oCoord.y];
+    // this.logger.debug("****alignElWithMouse : " + el.id + ", " + aCoord + ", " + el.style.display);
+    YAHOO.util.Dom.setXY(el, aCoord);
+
+    this.cachePosition(oCoord.x, oCoord.y);
+
+    this.autoScroll(oCoord.x, oCoord.y, el.offsetHeight, el.offsetWidth);
+};
+
+/**
+ * Saves the most recent position so that we can reset the constraints and
+ * tick marks on-demand.  We need to know this so that we can calculate the
+ * number of pixels the element is offset from its original position.
+ */
+YAHOO.util.DD.prototype.cachePosition = function(iPageX, iPageY) {
+    if (iPageX) {
+        this.lastPageX = iPageX;
+        this.lastPageY = iPageY;
+    } else {
+        var aCoord = YAHOO.util.Dom.getXY(this.getEl());
+        this.lastPageX = aCoord[0];
+        this.lastPageY = aCoord[1];
+    }
+};
+
+/**
+ * Auto-scroll the window if the dragged object has been moved beyond the
+ * visible window boundary.
+ *
+ * @param {int} x the drag element's x position
+ * @param {int} y the drag element's y position
+ * @param {int} h the height of the drag element
+ * @param {int} w the width of the drag element
+ * @private
+ */
+YAHOO.util.DD.prototype.autoScroll = function(x, y, h, w) {
+
+    if (this.scroll) {
+        // The client height
+        var clientH = this.DDM.getClientHeight();
+
+        // The client width
+        var clientW = this.DDM.getClientWidth();
+
+        // The amt scrolled down
+        var st = this.DDM.getScrollTop();
+
+        // The amt scrolled right
+        var sl = this.DDM.getScrollLeft();
+
+        // Location of the bottom of the element
+        var bot = h + y;
+
+        // Location of the right of the element
+        var right = w + x;
+
+        // The distance from the cursor to the bottom of the visible area,
+        // adjusted so that we don't scroll if the cursor is beyond the
+        // element drag constraints
+        var toBot = (clientH + st - y - this.deltaY);
+
+        // The distance from the cursor to the right of the visible area
+        var toRight = (clientW + sl - x - this.deltaX);
+
+        // this.logger.debug( " x: " + x + " y: " + y + " h: " + h +
+        // " clientH: " + clientH + " clientW: " + clientW +
+        // " st: " + st + " sl: " + sl + " bot: " + bot +
+        // " right: " + right + " toBot: " + toBot + " toRight: " + toRight);
+
+        // How close to the edge the cursor must be before we scroll
+        // var thresh = (document.all) ? 100 : 40;
+        var thresh = 40;
+
+        // How many pixels to scroll per autoscroll op.  This helps to reduce
+        // clunky scrolling. IE is more sensitive about this ... it needs this
+        // value to be higher.
+        var scrAmt = (document.all) ? 80 : 30;
+
+        // Scroll down if we are near the bottom of the visible page and the
+        // obj extends below the crease
+        if ( bot > clientH && toBot < thresh ) {
+            window.scrollTo(sl, st + scrAmt);
+        }
+
+        // Scroll up if the window is scrolled down and the top of the object
+        // goes above the top border
+        if ( y < st && st > 0 && y - st < thresh ) {
+            window.scrollTo(sl, st - scrAmt);
+        }
+
+        // Scroll right if the obj is beyond the right border and the cursor is
+        // near the border.
+        if ( right > clientW && toRight < thresh ) {
+            window.scrollTo(sl + scrAmt, st);
+        }
+
+        // Scroll left if the window has been scrolled to the right and the obj
+        // extends past the left border
+        if ( x < sl && sl > 0 && x - sl < thresh ) {
+            window.scrollTo(sl - scrAmt, st);
+        }
+    }
+};
+
+/**
+ * Finds the location the element should be placed if we want to move
+ * it to where the mouse location less the click offset would place us.
+ *
+ * @param {int} iPageX the X coordinate of the click
+ * @param {int} iPageY the Y coordinate of the click
+ * @return an object that contains the coordinates (Object.x and Object.y)
+ * @private
+ */
+YAHOO.util.DD.prototype.getTargetCoord = function(iPageX, iPageY) {
+
+    // this.logger.debug("getTargetCoord: " + iPageX + ", " + iPageY);
+
+    var x = iPageX - this.deltaX;
+    var y = iPageY - this.deltaY;
+
+    if (this.constrainX) {
+        if (x < this.minX) { x = this.minX; }
+        if (x > this.maxX) { x = this.maxX; }
+    }
+
+    if (this.constrainY) {
+        if (y < this.minY) { y = this.minY; }
+        if (y > this.maxY) { y = this.maxY; }
+    }
+
+    x = this.getTick(x, this.xTicks);
+    y = this.getTick(y, this.yTicks);
+
+    // this.logger.debug("getTargetCoord " +
+            // " iPageX: " + iPageX +
+            // " iPageY: " + iPageY +
+            // " x: " + x + ", y: " + y);
+
+    return {x:x, y:y};
+};
+
+// overrides YAHOO.util.DragDrop
+YAHOO.util.DD.prototype.b4MouseDown = function(e) {
+    // this.resetConstraints();
+    this.autoOffset(YAHOO.util.Event.getPageX(e),
+                        YAHOO.util.Event.getPageY(e));
+};
+
+// overrides YAHOO.util.DragDrop
+YAHOO.util.DD.prototype.b4Drag = function(e) {
+    this.setDragElPos(YAHOO.util.Event.getPageX(e),
+                        YAHOO.util.Event.getPageY(e));
+};
+
+
+///////////////////////////////////////////////////////////////////////////////
+// Debugging ygDragDrop events that can be overridden
+///////////////////////////////////////////////////////////////////////////////
+/*
+YAHOO.util.DD.prototype.startDrag = function(x, y) {
+    this.logger.debug(this.id.toString()  + " startDrag");
+};
+
+YAHOO.util.DD.prototype.onDrag = function(e) {
+    this.logger.debug(this.id.toString() + " onDrag");
+};
+
+YAHOO.util.DD.prototype.onDragEnter = function(e, id) {
+    this.logger.debug(this.id.toString() + " onDragEnter: " + id);
+};
+
+YAHOO.util.DD.prototype.onDragOver = function(e, id) {
+    this.logger.debug(this.id.toString() + " onDragOver: " + id);
+};
+
+YAHOO.util.DD.prototype.onDragOut = function(e, id) {
+    this.logger.debug(this.id.toString() + " onDragOut: " + id);
+};
+
+YAHOO.util.DD.prototype.onDragDrop = function(e, id) {
+    this.logger.debug(this.id.toString() + " onDragDrop: " + id);
+};
+
+YAHOO.util.DD.prototype.endDrag = function(e) {
+    this.logger.debug(this.id.toString() + " endDrag");
+};
+*/
+
+/* Copyright (c) 2006 Yahoo! Inc. All rights reserved. */
+
+/**
+ * @class a DragDrop implementation that inserts an empty, bordered div into
+ * the document that follows the cursor during drag operations.  At the time of
+ * the click, the frame div is resized to the dimensions of the linked html
+ * element, and moved to the exact location of the linked element.
+ *
+ * @extends YAHOO.util.DD
+ * @constructor
+ * @param {String} id the id of the linked html element
+ * @param {String} sGroup the group of related DragDrop objects
+ */
+YAHOO.util.DDProxy = function(id, sGroup) {
+    if (id) {
+        this.init(id, sGroup);
+        this.initFrame();
+        this.logger.setModuleName("DDProxy");
+    }
+};
+
+YAHOO.util.DDProxy.prototype = new YAHOO.util.DD();
+
+/**
+ * A reference to the one div element we create for all instances of this class
+ *
+ * @type Object
+ */
+YAHOO.util.DDProxy.frameDiv = null;
+
+/**
+ * the drag frame div id
+ *
+ * @type String
+ */
+YAHOO.util.DDProxy.dragElId = "ygddfdiv";
+
+/**
+ * The border width of the frame.  This is used when we resize the frame to
+ * the size of the linked element.  We substract the border width to make
+ * the div the correct size.
+ *
+ * @TODO find a better way to handle this
+ *
+ * @type int
+ */
+YAHOO.util.DDProxy.prototype.borderWidth = 2;
+
+/**
+ * By default we resize the drag frame to be the same size as the element
+ * we want to drag (this is to get the frame effect).  We can turn it off
+ * if we want a different behavior (ex: ygDDMy2)
+ *
+ * @type boolean
+ */
+YAHOO.util.DDProxy.prototype.resizeFrame = true;
+
+/**
+ * By default the frame is positioned exactly where the drag element is, so
+ * we use the cursor offset provided by YAHOO.util.DD.  Another option that works only if
+ * you do not have constraints on the obj is to have the drag frame centered
+ * around the cursor.  Set centerFrame to true for this effect.  Ex:
+ * ygDDMy2
+ *
+ * @type boolean
+ */
+YAHOO.util.DDProxy.prototype.centerFrame = false;
+
+/**
+ * Create the drag frame if needed
+ */
+YAHOO.util.DDProxy.createFrame = function() {
+    var THIS = YAHOO.util.DDProxy;
+
+    if (!document || !document.body) {
+        setTimeout(THIS.createFrame, 50);
+        return;
+    }
+
+    if (!THIS.frameDiv) {
+        THIS.frameDiv = document.createElement("div");
+        THIS.frameDiv.id = THIS.dragElId;
+        var s = THIS.frameDiv.style;
+        s.position = "absolute";
+        s.visibility = "hidden";
+        s.cursor = "move";
+        s.border = "2px solid #aaa";
+        s.zIndex = 999;
+
+        document.body.appendChild(THIS.frameDiv);
+    }
+};
+
+/**
+ * Initialization for the drag frame element.  Must be called in the
+ * constructor of all subclasses
+ */
+YAHOO.util.DDProxy.prototype.initFrame = function() {
+    YAHOO.util.DDProxy.createFrame();
+    this.setDragElId(YAHOO.util.DDProxy.dragElId);
+    this.useAbsMath = true;
+};
+
+/**
+ * Resizes the drag frame to the dimensions of the clicked object, positions
+ * it over the object, and finally displays it
+ *
+ * @param {int} iPageX X click position
+ * @param {int} iPageY Y click position
+ * @private
+ */
+YAHOO.util.DDProxy.prototype.showFrame = function(iPageX, iPageY) {
+    var el = this.getEl();
+
+    var s = this.getDragEl().style;
+
+    if (this.resizeFrame) {
+        s.width = (parseInt(el.offsetWidth) - (2*this.borderWidth)) + "px";
+        s.height = (parseInt(el.offsetHeight) - (2*this.borderWidth)) + "px";
+    }
+
+    if (this.centerFrame) {
+        this.setDelta(Math.round(parseInt(s.width)/2),
+                Math.round(parseInt(s.width)/2));
+    }
+
+    this.setDragElPos(iPageX, iPageY);
+
+    s.visibility = "";
+};
+
+// overrides YAHOO.util.DragDrop
+YAHOO.util.DDProxy.prototype.b4MouseDown = function(e) {
+    var x = YAHOO.util.Event.getPageX(e);
+    var y = YAHOO.util.Event.getPageY(e);
+    this.autoOffset(x, y);
+    this.setDragElPos(x, y);
+};
+
+// overrides YAHOO.util.DragDrop
+YAHOO.util.DDProxy.prototype.b4StartDrag = function(x, y) {
+    // show the drag frame
+    this.logger.debug("start drag show frame, x: " + x + ", y: " + y);
+    this.showFrame(x, y);
+};
+
+// overrides YAHOO.util.DragDrop
+YAHOO.util.DDProxy.prototype.b4EndDrag = function(e) {
+    this.logger.debug(this.id + " b4EndDrag");
+
+    // hide the drag frame
+    var s = this.getDragEl().style;
+    s.visibility = "hidden";
+};
+
+// overrides YAHOO.util.DragDrop
+// By default we try to move the element to the last location of the frame.
+// This is so that the default behavior mirrors that of YAHOO.util.DD.
+YAHOO.util.DDProxy.prototype.endDrag = function(e) {
+    this.logger.debug(this.id + " endDrag");
+    var lel = this.getEl();
+    var del = this.getDragEl();
+
+    // Show the drag frame briefly so we can get its position
+    del.style.visibility = "";
+
+    // Hide the linked element before the move to get around a Safari
+    // rendering bug.
+    lel.style.visibility = "hidden";
+    YAHOO.util.DDM.moveToEl(lel, del);
+    del.style.visibility = "hidden";
+    lel.style.visibility = "";
+};
+
+/* Copyright (c) 2006 Yahoo! Inc. All rights reserved. */
+
+/**
+ * @class a DragDrop implementation that does not move, but can be a drop
+ * target.  You would get the same result by simply omitting implementation
+ * for the event callbacks, but this way we reduce the processing cost of the
+ * event listener and the callbacks.
+ *
+ * @extends YAHOO.util.DragDrop
+ * @constructor
+ * @param {String} id the id of the element that is a drop target
+ * @param {String} sGroup the group of related DragDrop objects
+ */
+
+YAHOO.util.DDTarget = function(id, sGroup) {
+    if (id) {
+        this.initTarget(id, sGroup);
+        this.logger.setModuleName("DDTarget");
+    }
+};
+
+YAHOO.util.DDTarget.prototype = new YAHOO.util.DragDrop();
+