Plugin: Hover Image

I’ve used this plugin before and it was fine, but for some reason, the images I’m using aren’t aligning right on top of each other. Does anyone have a great hover image code I should be using instead? Need a “portfolio of images” on one page similar to this:

http://www.burnhamdesign.com/portfolio.php

here’s the link to what my issue is on my site:

http://www.tinkerbdesigns.com/testblog/?page_id=121