function show_popup(wid,hei,url,win) {
	var lrcenter = (screen.width - wid) / 2;
	var tbcenter = (screen.height - hei) / 2;
	var window_prop = "'scrollbars=no, resizable=yes, status=yes, width=" + wid +", height=" + hei +", left=" + lrcenter + ", top= " + tbcenter + "'";
	window.open(url, win, window_prop);
}

function window_close(){
	var strUA = "";
	strUA = navigator.userAgent.toLowerCase();
	if (strUA.indexOf("msie") != -1) {
		window.opener=true;
		window.open("","_self");
		window.close();
	} else {
		top.name = 'CLOSE_WINDOW';
		wid = window.open('','CLOSE_WINDOW');
		top.close();
	}
}