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);