/* ***********************************************************
** DETECT.JS - JS Browser/Version/Platform Detection Library
** =========================================================
** This library contains functions to detect/return the user's
** browser, version, and platform and to jump to a URL if
** the user is using a specified browser and/or version and/or
** platform. It's yours for free; please maintain this header!
**
** To load this library in an HTML doc, put the following
** line in the doc's HEAD (before any other SCRIPT tags):
**
** <SCRIPT SRC="detect.js" LANGUAGE="JavaScript"></SCRIPT>
**
** Author      Ver  Date    Comments
** ======      ===  ====    ========
** Rick Scott  1.0  1/1/00  First release
**
** Copyright 2000, Rick Scott, all rights reserved.
*********************************************************** */

/* ***********************************************************
** Functions
** =========
** getBrowser()
**   returns browser: "netscape", "ie", "other"
** getBrowserVer()
**   returns browser version number or "n/a"
** getPlatform()
**   returns browser OS: "mac", "win", "unix", "other"
** ifBVPjump(browser, version, platform, URL);
**   jumps to URL if user's browser, version, platform all
**   match the first three arguments
**   browser - "netscape", "ie", "other", "any"
**   version - "#.x", "#.#[#]", "any"
**             "#.x" matches any version #
**               ex: "4.x" matches 4.0, 4.05, 4.5, etc.
**             "#.#[#]" matches only version #.#[#]
**               ex: "4.05" matches 4.05, not 4.0, 4.5 
**   platform - "mac", "win", "unix", "other", "any"
**   URL - relative or absolute URL
**   examples:
**     ifBVPjump("ie", "4.x", "win", "ie4winpage.html");
**       would jump to ie4winpage.html if the user's BVP
**       were IE, 4.x, Windows
**     ifBVPjump("IE", "4.x", "win", "ie4winpage.html");
**       wouldn't work because "ie" is case-sensitive
**    ifBVPjump("any", "any", "unix", "unixpage.html");
**       would jump to unixpage.html if user's P were UNIX
**     ifBVPjump("any", "any", "any", "index.html");
**       would jump to index.html regardless of user's BVP
** isNetscape()
**   returns true if Netscape, false if not
** isIE()
**   returns true if IE, false if not
** isVer3()
**   returns true if version is 3.x, false if not
** isVer4()
**   returns true if version is 4.x, false if not
** isVer4up()
**   returns true if version is 4.0+, false if not
**   this is a quick way to test for DHTML capability
** isVer5()
**   returns true if version is 5.x, false if not
** isMac()
**   returns true if OS is Mac, false if not
** isWin()
**   returns true if OS is Windows, false if not
** isUNIX()
**   returns true if OS is UNIX, false if not
*********************************************************** */

function getBrowser()  // get the browser program name
	{
	if ( navigator.appName == null || navigator.appName == "" )
		return "other";
	else if ( navigator.appName == "Netscape" )
		return "netscape";
	else if ( navigator.appName == "Microsoft Internet Explorer" )
		return "ie";
	else
		return "other";
	}

function isNetscape()  // is browser Netscape?
	{
	if ( getBrowser() == "netscape" )
		return true;
	else
		return false;
	}

function isIE()	 // is browser IE?
	{
	if ( getBrowser() == "ie" )
		return true;
	else
		return false;
	}

function getBrowserVer()  // get the browser version
	{
	if ( navigator.appVersion == null || navigator.appVersion == "" )
		return "n/a";
	// fix for IE 5.x appVersion bug, which returns 4.x instead of 5.x
	if ( isIE() && navigator.userAgent.indexOf("5.") != -1 )
		{
		var verNum = "";
		var str = navigator.userAgent;
		var pos = str.indexOf("IE ");  // real version num follows "IE "
		for ( pos=pos+3; pos<str.length; pos++ )  // build verNum string
			if ( str.charAt(pos) == "." || 
				 (str.charAt(pos) <= "9" && str.charAt(pos) >= "0") )
				verNum += str.charAt(pos);
			else
				break;
		return verNum;
		}
	var verArray = navigator.appVersion.split(" ");
	return verArray[0];
	}

function isVer3()  // is browser version 3.x?
	{
	if ( getBrowserVer() >= 3.0 && getBrowserVer() < 4.0 )
		return true;
	else
		return false;
	}

function isVer4()  // is browser version 4.x?
	{
	if ( getBrowserVer() >= 4.0 && getBrowserVer() < 5.0 )
		return true;
	else
		return false;
	}

function isVer4up()	 // is browser version 4.0+? (for DHTML coding)
	{
	if ( getBrowserVer() >= 4.0 )
		return true;
	else
		return false;
	}

function isVer5()  // is browser version 5.x?
	{
	if ( getBrowserVer() >= 5.0 && getBrowserVer() < 6.0 )
		return true;
	else
		return false;
	}

function getPlatform()	// get the browser platform (OS)
	{
	if ( navigator.platform == null || navigator.platform == "" )
		return "other";
	else if ( navigator.platform.indexOf("Mac") >= 0 )
		return "mac";
	else if ( navigator.platform.indexOf("Win") >= 0 )
		return "win";
	else if ( navigator.platform.indexOf("Unix") >= 0 )
		return "unix";
	else
		return "other";
	}

function isMac()  // is browser OS Mac?
	{
	if ( getPlatform() == "mac" )
		return true;
	else
		return false;
	}

function isWin()  // is browser OS Windows?
	{
	if ( getPlatform() == "win" )
		return true;
	else
		return false;
	}

function isUNIX()  // is browser OS UNIX?
	{
	if ( getPlatform() == "unix" )
		return true;
	else
		return false;
	}

function ifBVPjump(browser, version, platform, URL)
	{
	// first make sure that version = user's browser version
	if ( version.indexOf("x") != -1 )  // version is in "#.x" format
		{
		if ( (version.charAt(0) == "3") && (isVer3() == false) )
			return;	 // version's incorrect, return
		else if ( (version.charAt(0) == "4") && (isVer4() == false) )
			return;	 // version's incorrect, return 
		else if ( (version.charAt(0) == "5") && (isVer5() == false) )
			return;	 // version's incorrect, return 
		} 
	else if ( version.indexOf(".") != -1 ) // version is in #.#[#] format
		{
		if ( version != getBrowserVer() )
			return;	 // version's incorrect, return to caller
		}
	// okay, version's correct, but what about browser/platform?
	if ( ((browser == getBrowser()) || (browser == "any"))
		 && 
		 ((platform == getPlatform()) || (platform == "any")) )
		top.document.location.href = URL;  // BVP all correct, jump!
	else
		return;	 // B and/or P incorrect, return
	}