The issue with the stretch is because the description is squished. Its on the page, but put into a small column so it's extending downward... alot.
This can be fixed by changing the margin of the descr (its in the a style attribute, so inline). I would just delete it entirely. Your images are also taking up 300+ px width.
Another issue is that the the images are floated.
Code:
.product-details .image {
Remove the float: left; on that or else the description will be over your images.