That error is stating that the jQuery object, does not have the method loadAllExtensions. I don't know how OSCommerce works, so I cannot really be of much help here.
@AnthonySterling: I'm a PHP developer, a consultant for oopnorth.com and the organiser of @phpne, a PHP User Group covering the North-East of England.
Look for a file with the string 'jQuery' in its name, now somehow that file is not being loaded, so you'd need to find out what/where files are included.
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