Option to hide owned games from showing up

First off, I really like the new layout of steamgifts, you really did a great job on it :)

I'd very much like an option to only show games in the list that you don't own yet, I assume you're loading the list with a mysql query thus adding a WHERE-clause shouldn't be too hard to implement.
This makes it much easier to navigate the website to look for giveaways you'd like to join and also reduce the used bandwidth (less owned games = smaller list to navigate through).