function open_window(url,new_win_width,new_win_height)
  {
	
   if((!new_win_width)||(!new_win_height))
   {
    var imageObject = new Image();
    imageObject.src = url;

    if(imageObject.complete) 
	{
    	new_win_width=imageObject.width+30;
		new_win_height=imageObject.height+30;	
		
		var new_win=null;
		new_win=window.open("","",
                       "location=no,toolbar=no,width="+new_win_width+
                       ",height="+new_win_height+", top=10, directories=no,status=no,"+
                       "scrollbars=yes,resizable=no,menubar=no");
		new_win.location.href=url;
		new_win.focus();
					   
    } else 
	{
        window.setTimeout('open_window("'+url+'")', 1000);
    }

   }	
   
  }