Programatically fire events on DOM elements

fireEvent.js

/**
* Function to fire events programatically
* on DOM elements
*
* Example:
*   var domEl = document.getElementById('elementId')
*   fireEvent(domEl, 'mouseover')
*
* @param {Node} el DOM element
* @param {String} Event name as String
* 
*/
function fireEvent(el, eventName)
{
  if(el) {
    if(el.fireEvent) {
      el.fireEvent('on' + eventName);
    } else {   
      var evObj = document.createEvent('Events');
      evObj.initEvent(eventName, true, false);
      el.dispatchEvent(evObj);
    }
  }
}