code: function(ev) {
              YUE.stopPropagation(ev);
              // must provide the TARGET or IE will destroy the event before we can
              // use it. Thanks Nicholas Zakas for pointing this out to me
              var target = YUE.getTarget(ev);
              this._hoverTimer = YAHOO.lang.later(this.get('_hoverTimeout'), this, function(){
                  this._onClick(target);
               });
          }
docs: Mouseover event handler
  @method _onMouseOver
  @param {Event} ev The Dom event
  @private