Javascript - override or prevent execution
<p>I'm working on a client project and I have to include their header and footer, which includes some core javascript files. I have a couple of PNGs on the page, but their core JS file is poorly coded and doesn't check for IE 7 before attempting to replace IMG tags that contain .png files with DIVS that use the AlphaImageLoader filter. The result is that in IE 7, all my .png images are replaced with DIV tags that have a default display: block, causing a linebreak after every single png image in my pages.</p>

<p>What I'd like to do is override their function with a better one or somehow prevent theirs from executing, but I cannot modify the js file itself, which both defines the function and attaches it to the window onload event. I've tried redefining the function under the same name in several places (header, just before the /body tag, in $(document).ready, etc...) but the original function always seems to execute, presumably because the original function code is what is stored with the event handler, and not merely a pointer to the function.</p>

<p>Any way I can fix? Is there a way to selectively remove onload event handlers?</p>
