ISA-How Can I Display Products Sorted By Product ID?

We are running CRM/ISA 4.0 SP8. When a group of products is displayed from a catalog area, the products are presented on the screen in no useful order. Our customers have asked us to display the products sorted by product number. We have looked in the jsp's to see if there is way to do an 'order by' in the query but so far we have had no success. Has anyone tried changing the order that products are displayed in ISA?

Thanks

Jon