var popup;
function OpenPopup(url,x,y) {
	if(popup != undefined)
	    if(!popup.closed)
			popup.focus();
	if(x == undefined)
		x = 800;
	if(y == undefined)
		y = 800;
	popup = window.open(url,'popup',
		'toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=yes,copyhistory=yes,resizable=yes,'
		+'width='+x+',height='+y);
}