How to find event listeners on a DOM node when debugging or from the JavaScript code?

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I have a page where some
event listeners are attached to input boxes and select boxes. Is there a way to find out
which event listeners are observing a particular DOM node and for what
event?

Events are attached
using:

1. href="http://en.wikipedia.org/wiki/Prototype_JavaScript_Framework"
   rel="noreferrer">Prototype's
   Event.observe;


2. DOM's
   addEventListener;


3. As element
   attribute
   element.onclick.

Answer

If you just need to inspect what's happening
on a page, you might try the href="http://www.sprymedia.co.uk/article/Visual+Event" rel="noreferrer">Visual
Event
bookmarklet.

Update:
rel="noreferrer">Visual Event 2 available;