What am I doing wrong? Simple CSS image gallery please help =)

I really need some help with this, I will be forever in your debt.
What am I doing wrong?
html: http://paperpiratestudio.com/blake/lm/index.html
css: http://paperpiratestudio.com/blake/lm/css/styles.css

The enlarged image in my image gallery follows the cursor horizontally, but I need it to follow vertically, too. Notice when you hover over the lower images, the full sized image is still on the top. I can't figure it out for the life of me!

Please help!

THANKS!!