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