/**
    * Event.simulate(@element, eventName[, options]) -> Element
    *
    * - @element: element to fire event on
    * - eventName: name of event to fire (only MouseEvents and HTMLEvents interfaces are supported)
    * - options: optional object to fine-tune event properties - pointerX, pointerY, ctrlKey, etc.
    *
    * $('foo').simulate('click'); // => fires "click" event on an element with id=foo
    *
    **/
    (function(){

      var eventMatchers = {
        'HTMLEvents': /^(?:load|unload|abort|error|select|change|submit|reset|focus|blur|resize|scroll)$/,
        'MouseEvents': /^(?:click|mouse(?:down|up|over|move|out))$/
      }
      var defaultOptions = {
        pointerX: 0,
        pointerY: 0,
        button: 0,
        ctrlKey: false,
        altKey: false,
        shiftKey: false,
        metaKey: false,
        bubbles: true,
        cancelable: true
      }

      Event.simulate = function(element, eventName) {
        var options = Object.extend(defaultOptions, arguments[2] || { });
        var oEvent, eventType = null;

        element = $(element);

        for (var name in eventMatchers) {
          if (eventMatchers[name].test(eventName)) { eventType = name; break; }
        }

        if (!eventType)
          throw new SyntaxError('Only HTMLEvents and MouseEvents interfaces are supported');

        if (document.createEvent) {
          oEvent = document.createEvent(eventType);
          if (eventType == 'HTMLEvents') {
            oEvent.initEvent(eventName, options.bubbles, options.cancelable);
          }
          else {
            oEvent.initMouseEvent(eventName, options.bubbles, options.cancelable, document.defaultView,
              options.button, options.pointerX, options.pointerY, options.pointerX, options.pointerY,
              options.ctrlKey, options.altKey, options.shiftKey, options.metaKey, options.button, element);
          }
          element.dispatchEvent(oEvent);
        }
        else {
          options.clientX = options.pointerX;
          options.clientY = options.pointerY;
          oEvent = Object.extend(document.createEventObject(), options);
          element.fireEvent('on' + eventName, oEvent);
        }
        return element;
      }

      Element.addMethods({ simulate: Event.simulate });
    })()