Multiple Body Onload, not working

I’m using MarketTheme http://markettheme.com/demo/

It has a body onload for the product zoom effect. I’m needing to use a chained menu, http://www.dynamicdrive.com/dynamicindex1/chainedmenu/index.htm to be precise.

The dropdown will populate in FireFox, but not IE. It seems like something in WP could be preventing the dropdown from populating, but I have no idea what it could be. I’ve tried a couple of other methods of doing multipe onloads, but each time I get the same result.

Anyone have any suggestions to get this working?