// convert all characters to lowercase to simplify testing
    var agt=navigator.userAgent.toLowerCase();

    // *** BROWSER VERSION ***
    // Note: On IE5, these return 4, so use is_ie5up to detect IE5.
    var is_major = parseInt(navigator.appVersion);
    var is_minor = parseFloat(navigator.appVersion);

    var is_ie     = ((agt.indexOf("msie") != -1) && (agt.indexOf("opera") == -1));
    var is_ie3    = (is_ie && (is_major < 4));
    var is_ie4    = (is_ie && (is_major == 4) && (agt.indexOf("msie 4")!=-1) );
    var is_ie4up  = (is_ie && (is_major >= 4));
    var is_ie5    = (is_ie && (is_major == 4) && (agt.indexOf("msie 5.0")!=-1) );
    var is_ie5_5  = (is_ie && (is_major == 4) && (agt.indexOf("msie 5.5") !=-1));
    var is_ie5up  = (is_ie && !is_ie3 && !is_ie4);
    var is_ie5_5up =(is_ie && !is_ie3 && !is_ie4 && !is_ie5);
    var is_ie6    = (is_ie && (is_major == 4) && (agt.indexOf("msie 6.")!=-1) );
    var is_ie6up  = (is_ie && !is_ie3 && !is_ie4 && !is_ie5 && !is_ie5_5);

    // Note: Opera and WebTV spoof Navigator.  We do strict client detection.
    // If you want to allow spoofing, take out the tests for opera and webtv.
    var is_nav  = ((agt.indexOf('mozilla')!=-1) && (agt.indexOf('spoofer')==-1)
                && (agt.indexOf('compatible') == -1) && (agt.indexOf('opera')==-1)
                && (agt.indexOf('webtv')==-1) && (agt.indexOf('hotjava')==-1));
    var is_nav2 = (is_nav && (is_major == 2));
    var is_nav3 = (is_nav && (is_major == 3));
    var is_nav4 = (is_nav && (is_major == 4));
    var is_nav4up = (is_nav && (is_major >= 4));
    var is_navonly      = (is_nav && ((agt.indexOf(";nav") != -1) ||
                          (agt.indexOf("; nav") != -1)) );
    var is_nav6 = (is_nav && (is_major == 5));
    var is_nav6up = (is_nav && (is_major >= 5));
    var is_gecko = (agt.indexOf('gecko') != -1);

    var is_mac    = (agt.indexOf("mac")!=-1);

	var is_win   = ( (agt.indexOf("win")!=-1) || (agt.indexOf("16bit")!=-1) );


//
//	Returns the URL to the custom stylesheet for the client.  For IE, if the
//	client is not a Mac, they get a custom stylesheet.  For Netscape, if the
//	client is a Mac with Mozilla they get the same custom stylesheet other
//	Netscape users get.  Other Macs and (and other platforms and browsers)
//	will get the generic stylesheet, on the offhand hope that they will 
//	respect it.
//
function GetCSS() 
{
	var sCSS;
	if (is_mac && is_nav4) {
		sCSS = "stylesnetscapefourmac.css";	
	} else if (is_win && is_nav4) {
		sCSS = "stylesnetscapefourpc.css";	
	}
	
	// Use this for testing which script version loads
	// return ("http://localhost/autobot/" + "includes/" + sCSS);
	return ("includes/" + sCSS);
}


//
//	Includes the current stylesheet in the HTML
//
function WriteCSS() 
{
	var sCSS = GetCSS();
	if (sCSS.length > 0) document.write("<link rel=\"stylesheet\" href=\"" + sCSS + "\">");
}