That is a javascript function from Cute Editor

In CuteSoft_Client\CuteEditor\Scripts\IE_Implementation\CuteEditorImplementation.js

 

function ShowDialog(handler,url,args,feature)
{
 var win=_dialogWindow||window;
 _dialogWindow=null;
 return Window_ShowDialog(win,handler,url,args,feature);
}

 

function Window_ShowDialog(win,handler,url,args,feature)
{
 var res=win.showModalDialog(url,args,feature);
 if(handler)
 {
  win.setTimeout(function CallHandler(){
   //alert(handler);
   handler(res);
  },1);
 }
 return;
}