/*
 * Save crossbrowser addEvent
 * From: http://www.dustindiaz.com/rock-solid-addevent/
 */

function addEvent( obj, type, fn ) {
   if (obj.addEventListener) {
      obj.addEventListener( type, fn, false );
      EventCache.add(obj, type, fn);
   }
   else if (obj.attachEvent) {
      obj["e"+type+fn] = fn;
      obj[type+fn] = function() { obj["e"+type+fn]( window.event ); }
      obj.attachEvent( "on"+type, obj[type+fn] );
      EventCache.add(obj, type, fn);
   }
   else {
      obj["on"+type] = obj["e"+type+fn];
   }
}

var EventCache = function(){
   var listEvents = [];
   return {
      listEvents : listEvents,
      add : function(node, sEventName, fHandler){
         listEvents.push(arguments);
      },
      flush : function(){
         var i, item;
         for(i = listEvents.length - 1; i >= 0; i = i - 1){
            item = listEvents[i];
            if(item[0].removeEventListener){
               item[0].removeEventListener(item[1], item[2], item[3]);
            };
            if(item[1].substring(0, 2) != "on"){
               item[1] = "on" + item[1];
            };
            if(item[0].detachEvent){
               item[0].detachEvent(item[1], item[2]);
            };
            item[0][item[1]] = null;
         };
      }
   };
}();
addEvent(window,'unload',EventCache.flush);