// ua.js - Detect Browser
// Requires JavaScript 1.1

// work around bug in xpcdom Mozilla 0.9.1
window.saveNavigator = window.navigator;

// Handy functions
function noop() {}
function noerror() { return true; }

function defaultOnError(msg, url, line)
{
  // customize this for your site
  //if (top.location.href.indexOf('/evangelism/lib/js/errors/') == -1)
  //  top.location = '/evangelism/lib/js/errors/index.html?msg=' + escape(msg) + '&url=' + escape(url) + '&line=' + escape(line);
}

// Display Error page... 
// XXX: more work to be done here
//
function reportError(message)
{
  // customize this for your site
  //if (top.location.href.indexOf('/evangelism/lib/js/errors/') == -1)
  //  top.location = '/evangelism/lib/js/errors/index.html?msg=' + escape(message);
}

function pageRequires(cond, msg, redirectTo)
{
  if (!cond)
  {
    msg = 'This page requires ' + msg;
    top.location = redirectTo + '?msg=' + escape(msg);
  }
  // return cond so can use in <A> onclick handlers to exclude browsers
  // from pages they do not support.
  return cond;
}

function detectBrowser()
{
  var oldOnError = window.onerror;
  var element = null;
  
  window.onerror = defaultOnError;

  navigator.OS    = '';
  navigator.version  = 0;
  navigator.org    = '';
  navigator.family  = '';

  var platform;
  if (typeof(window.navigator.platform) != 'undefined')
  {
    platform = window.navigator.platform.toLowerCase();
    if (platform.indexOf('win') != -1)
      navigator.OS = 'win';
    else if (platform.indexOf('mac') != -1)
      navigator.OS = 'mac';
    else if (platform.indexOf('unix') != -1 || platform.indexOf('linux') != -1 || platform.indexOf('sun') != -1)
      navigator.OS = 'nix';
  }

  var i = 0;
  var ua = window.navigator.userAgent.toLowerCase();
  
  if (ua.indexOf('opera') != -1)
  {
    i = ua.indexOf('opera');
    navigator.family  = 'opera';
    navigator.org    = 'opera';
    navigator.version  = parseFloat('0' + ua.substr(i+6), 10);
  }
  else if ((i = ua.indexOf('msie')) != -1)
  {
    navigator.org    = 'microsoft';
    navigator.version  = parseFloat('0' + ua.substr(i+5), 10);
    
    if (navigator.version < 4)
      navigator.family = 'ie3';
    else
      navigator.family = 'ie4'
  }
  else if (typeof(window.controllers) != 'undefined' && typeof(window.locationbar) != 'undefined')
  {
    i = ua.lastIndexOf('/')
    navigator.version = parseFloat('0' + ua.substr(i+1), 10);
    navigator.family = 'gecko';

    if (ua.indexOf('netscape') != -1)
      navigator.org = 'netscape';
    else if (ua.indexOf('compuserve') != -1)
      navigator.org = 'compuserve';
    else
      navigator.org = 'mozilla';
  }
  else if ((ua.indexOf('mozilla') !=-1) && (ua.indexOf('spoofer')==-1) && (ua.indexOf('compatible') == -1) && (ua.indexOf('opera')==-1)&& (ua.indexOf('webtv')==-1) && (ua.indexOf('hotjava')==-1))
  {
      var is_major = parseFloat(navigator.appVersion);
    
    if (is_major < 4)
      navigator.version = is_major;
    else
    {
      i = ua.lastIndexOf('/')
      navigator.version = parseFloat('0' + ua.substr(i+1), 10);
    }
    navigator.org = 'netscape';
    navigator.family = 'nn' + parseInt(navigator.appVersion);
  }
  else if ((i = ua.indexOf('aol')) != -1 )
  {
    // aol
    navigator.family  = 'aol';
    navigator.org    = 'aol';
    navigator.version  = parseFloat('0' + ua.substr(i+4), 10);
  }

  navigator.DOMCORE1  = (typeof(document.getElementsByTagName) != 'undefined' && typeof(document.createElement) != 'undefined');
  navigator.DOMCORE2  = (navigator.DOMCORE1 && typeof(document.getElementById) != 'undefined' && typeof(document.createElementNS) != 'undefined');
  navigator.DOMHTML  = (navigator.DOMCORE1 && typeof(document.getElementById) != 'undefined');
  navigator.DOMCSS1  = ( (navigator.family == 'gecko') || (navigator.family == 'ie4') );

  navigator.DOMCSS2   = false;
  if (navigator.DOMCORE1)
  {
    element = document.createElement('p');
    navigator.DOMCSS2 = (typeof(element.style) == 'object');
  }

  navigator.DOMEVENTS  = (typeof(document.createEvent) != 'undefined');

  window.onerror = oldOnError;
}

detectBrowser();