“element.dispatchEvent is not a function” js error caught in firebug of FF3.0

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are you using jquery and prototype on the same page by any chance?

If so, use jquery noConflict mode, otherwise you are overwriting prototypes $ function.

noConflict mode is activated by doing the following: 

<script src="https://stackoverflow.com/questions/980697/jquery.js"></script>
<script>jQuery.noConflict();</script>

Note: by doing this, the dollar sign variable no longer represents the jQuery object. To keep from rewriting all your jQuery code, you can use this little trick to create a dollar sign scope for jQuery:

jQuery(function ($) {
    // The dollar sign will equal jQuery in this scope
});

// Out here, the dollar sign still equals Prototype

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