function PopupWindow(Url,winName,winWidth,winHeight) {
	var win = null;
	var winLeft = (screen.width-winWidth)/2;
	var winTop = (screen.height-winHeight)/2;
	var winFeatures = "width="+winWidth+",height="+winHeight+",left="+winLeft+",top="+winTop+",\
	toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=1,resizable=1";
	win = window.open(Url, winName, winFeatures);
	if(parseInt(navigator.appVersion) >= 4){win.window.focus();}
}