var adyardBase = {
  _keyStr : "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",

  encode: function (input) {
    var output = "";
    var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
    var i = 0;

    while (i < input.length) {

      chr1 = input.charCodeAt(i++);
      chr2 = input.charCodeAt(i++);
      chr3 = input.charCodeAt(i++);

      enc1 = chr1 >> 2;
      enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
      enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
      enc4 = chr3 & 63;

      if (isNaN(chr2)) {
        enc3 = enc4 = 64;
      } else if (isNaN(chr3)) {
        enc4 = 64;
      }

      output = output +
      this._keyStr.charAt(enc1) + this._keyStr.charAt(enc2) +
      this._keyStr.charAt(enc3) + this._keyStr.charAt(enc4);
    }

    return output;
  },

  
  addListener: function(element, event, listener, bubble) {
    if (element.addEventListener) {
      if (typeof bubble == 'undefined'){
         bubble = false;
      }
      element.addEventListener(event, listener, bubble);
    } else if (this.attachEvent) {
      element.attachEvent("on" + event, listener);
    }
  }
};

adyardMonetizer = {
  vars: window.location.search.substring(1).split("&"),
  hostname: 'http://adfarm.adyard.de',
  user_id: '7c988f0e55ce1f7',
  unit_id: 5,
  
  __var: function(variable) 
  {
    for (var i=0; i<this.vars.length; i++) {
      var pair = this.vars[i].split("=");
      if (pair[0] == variable) {
        return pair[1];
      }
    }
    return false;
  },

  __track: function ()
  {
    var variables = ['source', 'medium', 'term', 'content', 'campaign']
    var trackvalues = {}
    var trackString = '';
    
    // for adwords tracking
    for (var i=0; i< variables.length; i++) {
      trackvalues[variables[i]] = this.__var('utm_'+variables[i])
    }
    
    if (trackvalues['campaign'] || trackvalues['term']) {
      var body = document.getElementsByTagName('body')[0];
      var trackImage = document.createElement('img');
      var trackString = "source_type=adwords;"
      for (var i=0; i< variables.length; i++) {
        value = trackvalues[variables[i]]
        if (typeof value != 'undefined' && value) {
          trackString += variables[i] + '=' + escape(value)+";";
        }
      }
    }
    
    if (trackString != '') {
      trackImage.src = this.hostname + '/srv/' + this.unit_id + '/t/' + escape(adyardBase.encode(trackString))
      trackImage.width = 1;
      trackImage.height = 1;
      trackImage.style.border = 'none !important';
      
      body.appendChild(trackImage);
    }
    
  },
  
  decorateLinks: function()
  {
    var links = document.getElementsByTagName('a')

    for(var i=0;i<links.length;i++) {
      if(links[i].href.match(/ad\.zanox\.com\/ppc/)) {
        links[i].href = this.hostname + '/srv/' + this.unit_id + '/p/' + escape(adyardBase.encode(links[i].href));
      }
    }
  }
}
adyardBase.addListener(window, 'load', function(){adyardMonetizer.__track()});
adyardBase.addListener(window, 'load', function(){adyardMonetizer.decorateLinks()});