It's worth noting that DOM4 spec makes third argument in addEventListener() method optional.

It will default to false if you skip it (which is almost always preferable):

  element.addEventListener('mousedown', callback);

There's also an object-based argument to addEventListener: http://www.w3.org/TR/DOM-Level-2-Events/events.html#Events-E...

More discussion here: http://ajaxian.com/archives/an-alternative-way-to-addeventli...