YUI: DragDrop ALWAYS on top

The Javascript

(function() {
    var Dom = YAHOO.util.Dom,
        Event = YAHOO.util.Event;

// Our custom drag and drop implementation, extending YAHOO.util.DD
    YAHOO.example.DDOnTop = function(id, sGroup, config) {
        YAHOO.example.DDOnTop.superclass.constructor.apply(this, arguments);
    };

//Cache the zIndex
    YAHOO.util.DDM._curZindex = 999;

YAHOO.extend(YAHOO.example.DDOnTop, YAHOO.util.DD, {
        startDrag: function(x, y) {
            YAHOO.log(this.id + " startDrag", "info", "example");

var style = this.getEl().style;

// The z-index needs to be set very high so the element will indeed be on top
            style.zIndex = YAHOO.util.DDM._curZindex;
            //Up the zIndex so the next call makes it higher
            YAHOO.util.DDM._curZindex++;
        }
    });

var dd, dd2, dd3;
        Event.onDOMReady(function() {
            dd = new YAHOO.example.DDOnTop("dd-demo-1");
            dd2 = new YAHOO.example.DDOnTop("dd-demo-2");
            dd3 = new YAHOO.example.DDOnTop("dd-demo-3");
        });

})();