Update cost total on a e-commerce type site on the fly

Update cost total on a e-commerce type site on the fly

Hey, maybe Jquery isn't the answer for this, but is there anyway to have the total cost of items in a computer builder be updated when the user selects different parts? So if they change processor from model-x to model-y, the grand total of the computer would be updated immediately.

If jquery may not be a solution, where could I look? Google didn't give me any good results unfortunately.

Thanks ahead of time!

Roeland