// Use is_ie5up and is_nav6up

// 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_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_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_webtv = (agt.indexOf("webtv") != -1); 

    var is_TVNavigator = ((agt.indexOf("navio") != -1) || (agt.indexOf("navio_aoltv") != -1)); 
    var is_AOLTV = is_TVNavigator;

    var is_hotjava = (agt.indexOf("hotjava") != -1);
    var is_hotjava3 = (is_hotjava && (is_major == 3));
    var is_hotjava3up = (is_hotjava && (is_major >= 3));

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

// Menu rollovers for IE5
// IE5 and up recognize "hover" on <td> elements, so use styles to change
// background of TD cells on hover
function rollOn(elem){
  if(is_ie5up || is_nav6up){
  elem.style.background = '#CCC';
  elem.style.cursor = 'hand';
}}

function rollOff(elem){
  if(is_ie5up || is_nav6up){
  elem.style.background= '#EEE';
  elem.style.cursor = 'default';
}}

function rollOn2(elem){
  if(is_ie5up || is_nav6up){
  elem.style.background = '#CCC';
  elem.style.cursor = 'hand';
}}

function rollOff2(elem){
  if(is_ie5up || is_nav6up){
  elem.style.background= '#FFF';
  elem.style.cursor = 'default';
}}


// Menu rollovers for other browsers
// For other browsers, change an image on <a> hover
function underline_on(imgName){
	document[imgName+"_underline"].src = "/images/space_ccc.gif";
}

// Unhighlight top and bottom borders on image rolloff
function underline_off(imgName){
	document[imgName+"_underline"].src = "/images/space.gif";
}


// SERVE BROWSER-SPECIFIC STYLESHEETS
// These stylesheets include extra CSS particular to each browser
if (is_nav4) {
  document.write('<link rel="stylesheet" type="text/css" href="/inc/style_nav4.css">');
}
// Mac - needs larger fonts usually
else if (is_mac) {
  document.write('<link rel="stylesheet" type="text/css" href="/inc/style_mac.css">');
}
else if (is_ie5up || is_nav6up) {
  document.write('<link rel="stylesheet" type="text/css" href="/inc/style_ie5nav6.css">');
}