Gallery2 Expert Needed

Am experiencing some problems with a Gallery2 site, principally in Internet Explorer (only checked version 8) - when a customer adds a product to the cart they are unable to enter the quantity required, click in input field and nothing happens - works fine in Firefox Need someone who either knows their way around Gallery2, or has experienced this problem before themselves or is a PHP expert to work out why this is happening. Need someone as soon as possible.