<!--
    // 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);

    // 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_gecko = (agt.indexOf('gecko') != -1);
    var is_mozilla = (is_gecko && agt.indexOf("netscape")==-1);
    var is_navonly = (is_nav && !is_mozilla);
    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_navonly && (is_major >= 4));
    var is_nav6 = (is_navonly) && 
	   ( (agt.indexOf("netscape 6")!=-1)
	   || (agt.indexOf("netscape/6")!=-1)
	   || (agt.indexOf("netscape6")!=-1) )
	   ;
    var is_nav6up = (is_navonly) 
	   && (!is_nav2)
	   && (!is_nav3)
	   && (!is_nav4)
	   ;
    var is_nav7 = (is_navonly) &&
	   ( (agt.indexOf("netscape 7")!=-1)
	   || (agt.indexOf("netscape/7")!=-1)
	   || (agt.indexOf("netscape7")!=-1) )
	   ;
    var is_nav7up = (is_navonly) 
	   && (!is_nav2)
	   && (!is_nav3)
	   && (!is_nav4)
	   && (!is_nav6)
	   ;

    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);

    // KNOWN BUG: On AOL4, returns false if IE3 is embedded browser
    // or if this is the first browser window opened.  Thus the
    // variables is_aol, is_aol3, and is_aol4 aren't 100% reliable.
    var is_aol   = (agt.indexOf("aol") != -1);
    var is_aol3  = (is_aol && is_ie3);
    var is_aol4  = (is_aol && is_ie4);
    var is_aol5  = (agt.indexOf("aol 5") != -1);
    var is_aol6  = (agt.indexOf("aol 6") != -1);

    var is_opera = (agt.indexOf("opera") != -1);
    var is_opera2 = (agt.indexOf("opera 2") != -1 || agt.indexOf("opera/2") != -1);
    var is_opera3 = (agt.indexOf("opera 3") != -1 || agt.indexOf("opera/3") != -1);
    var is_opera4 = (agt.indexOf("opera 4") != -1 || agt.indexOf("opera/4") != -1);
    var is_opera5 = (agt.indexOf("opera 5") != -1 || agt.indexOf("opera/5") != -1);
    var is_opera5up = (is_opera && !is_opera2 && !is_opera3 && !is_opera4);
    var is_opera6 = (agt.indexOf("opera 6") != -1 || agt.indexOf("opera/6") != -1);
    var is_opera6up = (is_opera 
	   && !is_opera2 
	   && !is_opera3 
	   && !is_opera4 
	   && !is_opera5);
//-->