var popUpWin=0;
    function popUpWindow(URLStr, left,top, width, height)
    {                
    	if(popUpWin)
    	{ 
    		if(!popUpWin.closed)
    		   popUpWin.close();  
    	}  
    	popUpWin = open(URLStr,'popUpWin','toolbar=no,location=no,directories=no,status=yes,menubar=no,scrollbars=yes,resizable=yes,copyhistory=yes,width='+width+',height='+height+',left='+left+', top='+top+',screenX='+left+',screenY='+top+'');
    }