// JavaScript Document
function open_popup(url, xwidth, xheight) {
	var leftPos = (screen.availWidth-xwidth) / 2;
	var topPos = (screen.availHeight-xheight) / 2;
	photo = window.open(url,'','width=' + xwidth + ',height=' + xheight + ',scrollbars=no,resizable=no,titlebar=0,top=' + topPos + ',left=' + leftPos);
}