function showPopup(page) {
	var winl = (screen.width - 480) / 2;
	var wint = (screen.height - 320) / 2;
	winprops = 'height=320,width=480,top='+wint+',left='+winl+',scrollbars=no,resizable';
	win = window.open(page, '', winprops);
	if (parseInt(navigator.appVersion) >= 4) { win.window.focus(); }
}