var popUpWin=0;
function popUpWindow(URLStr,windowName,nWidth,nHeight)
{
	if(popUpWin)
	{
		if(!popUpWin.closed) popUpWin.close();
	}
   	popUpWin = window.open(URLStr, windowName,"titlebar=no,toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=no,resizable=no,copyhistory=no,width="+nWidth+",height="+nHeight+",left=300,top=200");

}