/**
 * browser.js - Javascript to handle browser detection and feature detection
 *    
 * Based on:
 * // JavaScript Browser Sniffer
 * // Eric Krok, Andy King, Michel Plungjan Jan. 31, 2002
 * // see http://www.webreference.com/ for more information
 * //
 * // This program is free software; you can redistribute it and/or modify
 * // it under the terms of the GNU General Public License as published by
 * // the Free Software Foundation; either version 2 of the License, or
 * //  (at your option) any later version.    
 *
 * Copyright 2006, iMarc <info@imarc.net>
 * 
 * @version  1.0.0
 *
 * @author   William Bond  [wb] <will@imarc.net>
 * 
 * @changes  1.0.0 Initial implementation [wb, 2006-07-29]
 */

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

    // *** BROWSER VERSION ***

    var is_minor = parseFloat(appVer);
    var is_major = parseInt(is_minor);

    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_opera6 = (agt.indexOf("opera 6") != -1 || agt.indexOf("opera/6") != -1);
    var is_opera7 = (agt.indexOf("opera 7") != -1 || agt.indexOf("opera/7") != -1);
    var is_opera8 = (agt.indexOf("opera 8") != -1 || agt.indexOf("opera/8") != -1);
    var is_opera9 = (agt.indexOf("opera 9") != -1 || agt.indexOf("opera/9") != -1);
    var is_opera5up = (is_opera && !is_opera2 && !is_opera3 && !is_opera4);
    var is_opera6up = (is_opera && !is_opera2 && !is_opera3 && !is_opera4 && !is_opera5);
    var is_opera7up = (is_opera && !is_opera2 && !is_opera3 && !is_opera4 && !is_opera5 && !is_opera6);
    var is_opera8up = (is_opera && !is_opera2 && !is_opera3 && !is_opera4 && !is_opera5 && !is_opera6 && !is_opera7);
    var is_opera9up = (is_opera && !is_opera2 && !is_opera3 && !is_opera4 && !is_opera5 && !is_opera6 && !is_opera7 && !is_opera8);
    
    var is_mac = (agt.indexOf("mac")!=-1) ? true : false;
    var iePos  = appVer.indexOf('msie');
    if (iePos !=-1) {
       if(is_mac) {
           var iePos = agt.indexOf('msie');
           is_minor = parseFloat(agt.substring(iePos+5,agt.indexOf(';',iePos)));
       }
       else is_minor = parseFloat(appVer.substring(iePos+5,appVer.indexOf(';',iePos)));
       is_major = parseInt(is_minor);
    }
                                      
    var is_konq = false;
    var kqPos   = agt.indexOf('konqueror');
    if (kqPos !=-1) {                 
       is_konq  = true;
       is_minor = parseFloat(agt.substring(kqPos+10,agt.indexOf(';',kqPos)));
       is_major = parseInt(is_minor);
    }                                 

    var is_getElementById   = (document.getElementById) ? "true" : "false";
    var is_getElementsByTagName = (document.getElementsByTagName) ? "true" : "false";
    var is_documentElement = (document.documentElement) ? "true" : "false";

    var is_safari = ((agt.indexOf('safari')!=-1)&&(agt.indexOf('mac')!=-1))?true:false;
    var is_khtml  = (is_safari || is_konq);

    var is_gecko = ((!is_khtml)&&(navigator.product)&&(navigator.product.toLowerCase()=="gecko"))?true:false;
    var is_gver  = 0;
    if (is_gecko) is_gver=navigator.productSub;

    var is_fb = ((agt.indexOf('mozilla/5')!=-1) && (agt.indexOf('spoofer')==-1) &&
                 (agt.indexOf('compatible')==-1) && (agt.indexOf('opera')==-1)  &&
                 (agt.indexOf('webtv')==-1) && (agt.indexOf('hotjava')==-1)     &&
                 (is_gecko) && (navigator.vendor=="Firebird"));
    var is_fx = ((agt.indexOf('mozilla/5')!=-1) && (agt.indexOf('spoofer')==-1) &&
                 (agt.indexOf('compatible')==-1) && (agt.indexOf('opera')==-1)  &&
                 (agt.indexOf('webtv')==-1) && (agt.indexOf('hotjava')==-1)     &&
                 (is_gecko) && ((navigator.vendor=="Firefox")||(agt.indexOf('firefox')!=-1)));
    var is_cam = ((agt.indexOf('mozilla/5')!=-1) && (agt.indexOf('spoofer')==-1) &&
                 (agt.indexOf('compatible')==-1) && (agt.indexOf('opera')==-1)  &&
                 (agt.indexOf('webtv')==-1) && (agt.indexOf('hotjava')==-1)     &&
                 (is_gecko) && ((navigator.vendor=="Camino")||(agt.indexOf('camino')!=-1)));
    var is_flk = ((agt.indexOf('mozilla/5')!=-1) && (agt.indexOf('spoofer')==-1) &&
                 (agt.indexOf('compatible')==-1) && (agt.indexOf('opera')==-1)  &&
                 (agt.indexOf('webtv')==-1) && (agt.indexOf('hotjava')==-1)     &&
                 (is_gecko) && ((navigator.vendor=="Flock")||(agt.indexOf('flock')!=-1)));
    var is_moz   = ((agt.indexOf('mozilla/5')!=-1) && (agt.indexOf('spoofer')==-1) &&
                    (agt.indexOf('compatible')==-1) && (agt.indexOf('opera')==-1)  &&
                    (agt.indexOf('webtv')==-1) && (agt.indexOf('hotjava')==-1)     &&
                    (is_gecko) && (!is_fb) && (!is_fx) && (!is_flk) && (!is_cam) &&
                    ((navigator.vendor=="")||(navigator.vendor=="Mozilla")||(navigator.vendor=="Debian")));
    if ((is_moz)||(is_fb)||(is_fx)) {  // 032504 - dmr
       var is_moz_ver = (navigator.vendorSub)?navigator.vendorSub:0;
       if(is_fx&&!is_moz_ver) {
           is_moz_ver = agt.indexOf('firefox/');
           is_moz_ver = agt.substring(is_moz_ver+8);
           is_moz_ver = parseFloat(is_moz_ver);
       }
       if(!(is_moz_ver)) {
           is_moz_ver = agt.indexOf('rv:');
           is_moz_ver = agt.substring(is_moz_ver+3);
           is_paren   = is_moz_ver.indexOf(')');
           is_moz_ver = is_moz_ver.substring(0,is_paren);
       }
       is_minor = is_moz_ver;
       is_major = parseInt(is_moz_ver);
    }
   var is_fb_ver = is_moz_ver;
   var is_fx_ver = is_moz_ver;

    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)
                && (!is_khtml) && (!(is_moz)) && (!is_fb) && (!is_fx));

    if ((navigator.vendor)&&
        ((navigator.vendor=="Netscape6")||(navigator.vendor=="Netscape"))&&
        (is_nav)) {
       is_major = parseInt(navigator.vendorSub);
       is_minor = parseFloat(navigator.vendorSub);
    }

    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_minor >= 4);  

    var is_navonly      = (is_nav && ((agt.indexOf(";nav") != -1) ||
                          (agt.indexOf("; nav") != -1)) );

    var is_nav6   = (is_nav && is_major==6); 
    var is_nav6up = (is_nav && is_minor >= 6);

    var is_nav5   = (is_nav && is_major == 5 && !is_nav6);
    var is_nav5up = (is_nav && is_minor >= 5);

    var is_nav7   = (is_nav && is_major == 7);
    var is_nav7up = (is_nav && is_minor >= 7);

    var is_nav8   = (is_nav && is_major == 8);
    var is_nav8up = (is_nav && is_minor >= 8);

    var is_ie   = ((iePos!=-1) && (!is_opera) && (!is_khtml));
    var is_ie3  = (is_ie && (is_major < 4));

    var is_ie4   = (is_ie && is_major == 4);
    var is_ie4up = (is_ie && is_minor >= 4);
    var is_ie5   = (is_ie && is_major == 5);
    var is_ie5up = (is_ie && is_minor >= 5);
    
    var is_ie5_5  = (is_ie && (agt.indexOf("msie 5.5") !=-1));
    var is_ie5_5up =(is_ie && is_minor >= 5.5);     
	
    var is_ie6   = (is_ie && is_major == 6);
    var is_ie6up = (is_ie && is_minor >= 6);
    
    if (is_nav6up) {
       is_minor = navigator.vendorSub;
    }
    
    // Look for AJAX
    if (window.XMLHttpRequest || window.ActiveXObject) {
		ajax_enabled = true;
	} else {
        ajax_enabled = false;
    }