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.