mxTooltipHandler.prototype.destroy=function(){this.destroyed||(this.graph.removeMouseListener(this),mxEvent.release(this.div),null!=this.div&&null!=this.div.parentNode&&this.div.parentNode.removeChild(this.div),this.destroyed=!0,this.div=null)};function mxCellTracker(a,b,c){mxCellMarker.call(this,a,b);this.graph.addMouseListener(this);null!=c&&(this.getCell=c);mxClient.IS_IE&&mxEvent.addListener(window,"unload",mxUtils.bind(this,function(){this.destroy()}))}mxUtils.extend(mxCellTracker,mxCellMarker);