var ng = navigator;
var ua = ng.userAgent;
var nav = (ng.appName == 'Netscape');
var saf = (ng.appVersion.indexOf('Safari') != -1);
var ie4 = (ng.appVersion.indexOf('MSIE 4') != -1);
var mac = (ua.indexOf('Mac') != -1);
var aol = (ua.indexOf('AOL') != -1);
var hnd;

function popHelp(page) {
	var w = 400;
	var h = 450;
	if (window.screen) {
		var x = (screen.availWidth-w)/2;
		var y = 14+((screen.availHeight-h)/2);
	}
	var hnd = window.open(page, 'helpwin', 'resizable=no,width='+w+',height='+h+',screenx='+x+',screeny='+y+',left='+x+',top='+y);
	if (hnd && !ie4) { hnd.focus(); }
	return false;
}