Javascript: how to get a list of the event handlers bound to an event

Possible Duplicate:
How to find event listeners on a DOM node?

Given an element, let's say a div, is it possible to obtain a list of the handlers bound to a specific event fired by the element?

/* pseudo code: click on a div handlers? */
document.getElementById('myDiv').getHandlers('click');

Edit

Ok, here's some more details. I want to bind a click handler to a div, unless another handler is already bound to the div. What I have in mind is the following:

/* pseudo code: click on a div handlers? */
if(!document.getElementById('myDiv').getHandlers('click'))
   document.getElementById('myDiv').addEventListener('click', myEventhandler);