var win = null;
function PopupWindow(url, name, w, h){
	var l = (screen.width - w) / 2;
	var t = (screen.height - h) / 2;
	win = window.open(url, name, 'height='+h+',width='+w+',top='+t+',left='+l+',scrollbars=no,resizable=no');
	if (parseInt(navigator.appVersion) >= 4) { 
		win.window.focus();
	}
}