<font face='Arial'>I've been asked to put together a web based application that will allow someone to compare and contrast up to four products at a time. I've got some initial ideas on how this might be achieved. However, these ideas are very loosely based right now.

I need some high level help on how this might be done. The app would start by asking for a product category. It would then present a list of results. Then, up to four products would be selected from the results page. The user would then move onto the compare and contrast page. The easy part is searching and drawing up the results. The hard bit in my mind is the selection of up to only four products and then moving onto a page that will compare the selected products. This page would have to somehow adapt to the number of results selected.</font id='Arial'>