[gb2world]

I was going to advise you to be careful with just deleting the code that xcart has set using the inline styles for height and width, since you are also using their Detailed Images mod.

In the default template - those settings are used in a few places to layout the product page. They also have an imapct on how X-CART displays the detailed images with the mouseover effect. The height is also calculated and set inline with smarty so the detailed images mouseover will work properly in IE.

But I took a look around your site, and on your skin, your image width is being set is a way different from the default templates - so it is hard to advise you without seeing the template.

It appears the problem is only on your pages with detailed images - so something went wrong with your template in these files: skin1/customer/main/product.tpl and/or modules/Detailed_Product_Images/popup_image.tpl wherever you set inline styles.
Something is setting your inline styles to be very wide when you have detailed images.

You can try to figure out what happened to the smarty math that determines your inline css styles when you have detailed images present, or just do as Tal suggests and strip it all out. If you do strip it out - be sure and look at the detailed image mouseovers in IE to make sure those still work.