that could just be two layers, one for each pic and then they used a transperant gradient thing to make that disappear, oneo n each pic...let me test something, and Ill get back to you.
.::EDIT::.
Meh...my idea didnt work, I thought that it could but I think what Ebay.God said is waht he did, althoug hwe could be wrong, didnt beer $lut do that?