function _UserAgent() {
	var b = navigator.appName;
	var v = this.version = navigator.appVersion;
	var ua = navigator.userAgent.toLowerCase();	
	this.v = parseInt(v);
	this.safari = ua.indexOf("safari")>-1;	// always check for safari & opera 
	this.opera = ua.indexOf("opera")>-1;	// before ns or ie
	this.ns = !this.opera && !this.safari && (b=="Netscape");
	this.ie = !this.opera && (b=="Microsoft Internet Explorer");
	this.gecko = ua.indexOf('gecko')>-1; // check for gecko engine
	if (this.ns) {
		this.ns4 = (this.v==4);
		this.ns6 = (this.v>=5);
		this.b = "Netscape";
	}else if (this.ie) {
		this.ie4 = this.ie5 = this.ie55 = this.ie6 = false;
		if (v.indexOf('MSIE 4')>0) {this.ie4 = true; this.v = 4;}
		else if (v.indexOf('MSIE 5')>0) {this.ie5 = true; this.v = 5;}
		else if (v.indexOf('MSIE 5.5')>0) {this.ie55 = true; this.v = 5.5;}
		else if (v.indexOf('MSIE 6')>0) {this.ie6 = true; this.v = 6;}
		this.b = "MSIE";
	}else if (this.opera) {
		this.v=parseInt(ua.substr(ua.indexOf("opera")+6,1)); // set opera version
		this.opera6=(this.v>=6);
		this.opera7=(this.v>=7);
		this.b = "Opera";
	}else if (this.safari) {
		this.ns6 = (this.v>=5);	// ns6 compatible correct?
		this.b = "Safari";
	}
	this.dom = (document.createElement && document.appendChild && document.getElementsByTagName)? true : false;
	this.def = (this.ie||this.dom);
	this.win32 = ua.indexOf("win")>-1;
	this.mac = ua.indexOf("mac")>-1;
	this.other = (!this.win32 && !this.mac);
};

var ua = new _UserAgent();

function Trim(s) 
{
	// Remove leading spaces and carriage returns
	while ((s.substring(0,1) == ' ') || (s.substring(0,1) == '\n') || (s.substring(0,1) == '\r'))
	{
		s = s.substring(1,s.length);
	}

	// Remove trailing spaces and carriage returns
	while ((s.substring(s.length-1,s.length) == ' ') || (s.substring(s.length-1,s.length) == '\n') || (s.substring(s.length-1,s.length) == '\r'))
	{
		s = s.substring(0,s.length-1);
	}
	return s;
}

function GetElement(id)
{
	if (ua.ie && ua.v < 5) 
		return document.all[id];
	else if (ua.ns4) 
		return nav4GetLayerById(document, id);
	else if (ua.dom)
		return document.getElementById(id);
	else
		return null;
}

function nav4FindLayer(doc, id) 
{
	var i;
	var subdoc;
	var obj;
	for (i = 0; i < doc.layers.length; ++i) 
	{
		if (doc.layers[i].id && id == doc.layers[i].id)
			return doc.layers[i];
		subdoc = doc.layers[i].document;
		obj = nav4FindLayer(subdoc, id);
		if (obj != null) {
			return obj;
			}
		return null;
	}
}

function CheckRequired(element, message)
{
	if (Trim(element.value).length == 0)
	{
		alert(message);
		element.focus();
		return false;
	}
	return true;
}