function addEvent(elm, evType, fn, useCapture)
  {
  if(elm.addEventListener)
    {
    elm.addEventListener(evType, fn, useCapture);
    return true;
    }
  else if(elm.attachEvent)
    {
    var r = elm.attachEvent('on' + evType, fn);
    EventCache.add(elm, evType, fn);
    return r;
    }
  else
    elm['on' + evType] = fn;
  }

function getEventSrc(e)
  {
  if(!e)
    e = window.event;

  if(e.originalTarget)
    return e.originalTarget;
  else if(e.srcElement)
    return e.srcElement;
  }

function addLoadEvent(func)
  {
  var oldonload = window.onload;
  if(typeof window.onload != 'function')
    window.onload = func;
  else
    window.onload = function()
      {
      oldonload();
      func();
      }
  }

var EventCache = function()
  {
  var listEvents = [];
  return {
    listEvents : listEvents,

    add : function(node, sEventName, fHandler, bCapture){
      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]);

        /* From this point on we need the event names to be prefixed with 'on" */
        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, false);