event.js

var Event = {
  map: {},
  _addqueue: function(el, type, fn, init) {
    var queue = Event.map[type + el];
    if (!queue) {
      queue = [];
      init();
    }
    queue.push(fn);
  },
  _fire: function(type, el, e) {
    var queue = Event.map[type + el];
    for (var i = 0; i < queue.length; i++) {
      queue[i](e);
    }
  },
  add: function() {
    if (el.attachEvent) {
      return function(el, type, fn) {
        Event._addqueue(el, type, fn, function() {
          el.attachEvent('on' + type, function(e) {
            Event._fire(type, el, e);
          });
        });
      };
    } else {
      return function(el, type, fn) {
        Event._addqueue(el, type, fn, function() {
          el.addEventListener(type, function(e) {
            Event._fire(type, el, e);
          },
          false);
        });
      };
    }
  } (),
  _findfn: function(fn, queue) {
    for (var i = 0; i < queue.length; i++) {
      if (queue[i] == fn) return i;
    }
    return - 1;
  },
  _removeFn: function(el, type, fn, last) {
    var queue = Event.map[type + el];
    if (queue.length > 1) {
      var index = Event._findfn(fn, queue);
      if (index != - 1) queue.splice(index, 1);
    } else {
      queue = [];
      last(fn);
    }
  },
  remove: function(el, type, fn) {
    if (el.attachEvent) {
      return function(el, type, fn) {
        Event._removeFn(el, type, fn, function(fn) {
          el.detachEvent('on' + type, fn);
        });
      };
    } else {
      return function(el, type, fn) {
        Event._removeFn(el, type, fn, function(fn) {
          el.removeEventListener(type, fn, false);
        });
      };
    }
  } ()
};