custom 'add selected items to cart' button

I have a custom page that has been hard coded via html with a list of downloadable products and included on my product display page. They are a series of instructional videos. So on this page I have a list of the 7 videos, each with a checkbox for selection. Is there a way to collect the checked items and add them to the cart when the user selects 'add selected items to cart'? This is rather simple with one product, but multiple downloadable products is another story. :dontgetit

Check out a mod called Quick Order in the Free Software Add Ons. You wouldn't use it directly, but it probably contains the code you're looking for since it uses a single button to add a bunch of products to the cart all at once.

Rob