// Utility function to trim spaces from both ends of a string
function Trim(inString) 
{
	var retVal = "";
	var start = 0;
	while ((start < inString.length) && (inString.charAt(start) == ' ')) {
		++start;
	}
	var end = inString.length;
	while ((end > 0) && (inString.charAt(end - 1) == ' ')) {
		--end;
	}
	retVal = inString.substring(start, end);
	return retVal;
}

function BrowserDetector(ua) 
{
	// Defaults
	this.browser = "Unknown";
	this.platform = "Unknown";
	this.version = "";
	this.majorver = "";
	this.minorver = "";

	uaLen = ua.length;

	// ##### Split into stuff before parens and stuff in parens
	var preparens = "";
	var parenthesized = "";

	i = ua.indexOf("(");
	if (i >= 0) {
		preparens = Trim(ua.substring(0,i));
		parenthesized = ua.substring(i+1, uaLen);
		j = parenthesized.indexOf(")");
		if (j >= 0) {
			parenthesized = parenthesized.substring(0, j);
		}
	}
	else {
		preparens = ua;
	}

	// ##### First assume browser and version are in preparens
	// ##### override later if we find them in the parenthesized stuff
	var browVer = preparens;

	var tokens = parenthesized.split(";");
	var token = "";

	// # Now go through parenthesized tokens
	for (var i=0; i < tokens.length; i++) {
		token = Trim(tokens[i]);
		//## compatible - might want to reset from Netscape
		if (token == "compatible") {
			//## One might want to reset browVer to a null string
			//## here, but instead, we'll assume that if we don't
			//## find out otherwise, then it really is Mozilla
			//## (or whatever showed up before the parens).
			//## browser - try for Opera or IE
		}
		else if (token.indexOf("MSIE") >= 0) {
			browVer = token;
		}
		else if (token.indexOf("Opera") >= 0) {
			browVer = token;
		}
		//## platform - try for X11, SunOS, Win, Mac, PPC
		else if ((token.indexOf("X11") >= 0) || (token.indexOf("SunOS") >= 0) || (token.indexOf("Linux") >= 0)) {
			this.platform = "Unix";
		}
		else if (token.indexOf("Win") >= 0) {
			this.platform = "Win";
		}
		else if ((token.indexOf("Mac") >= 0) || (token.indexOf("PPC") >= 0)) {
			this.platform = "Mac";
		}
	}

	var msieIndex = browVer.indexOf("MSIE");
	if (msieIndex >= 0) {
		browVer = browVer.substring(msieIndex, browVer.length);
	}

	var leftover = "";
	if (browVer.substring(0, "Mozilla".length) == "Mozilla") {
		this.browser = "Netscape";
		leftover = browVer.substring("Mozilla".length+1, browVer.length);
	}
	else if (browVer.substring(0, "Lynx".length) == "Lynx") {
		this.browser = "Lynx";
		leftover = browVer.substring("Lynx".length+1, browVer.length);
	}
	else if (browVer.substring(0, "MSIE".length) == "MSIE") {
		this.browser = "IE";
		leftover = browVer.substring("MSIE".length+1, browVer.length);
	}
	else if (browVer.substring(0, "Microsoft Internet Explorer".length) == "Microsoft Internet Explorer") {
		this.browser = "IE"
		leftover = browVer.substring("Microsoft Internet Explorer".length+1,browVer.length);
	}
	else if (browVer.substring(0, "Opera".length) == "Opera") {
		this.browser = "Opera"
		leftover = browVer.substring("Opera".length+1, browVer.length);
	}

	leftover = Trim(leftover);

	// # Try to get version info out of leftover stuff
	i = leftover.indexOf(" ");
	if (i >= 0) {
		this.version = leftover.substring(0, i);
	}
	else {
		this.version = leftover;
	}

	j = this.version.indexOf(".");
	if (j >= 0) {
		this.majorver = this.version.substring(0,j);
		this.minorver = this.version.substring(j+1, this.version.length);
	}
	else {
		this.majorver = this.version;
	}
} // function BrowserDetector

var bd = new BrowserDetector(navigator.userAgent);