Hmm using IE Tester and testing your page in both IE7 and IE8 looks fine to me. Even when a browser says IE7 or IE8, they may be an older version of said browser that contains bugs addressed in the newer versions. IMO though IE7 is an entirely outdated browser that one shouldn't- and shouldn't- worry about anymore.
Just to test things out though, what happens if you disable the shadow effect inside the .js file? Does that makes things better in those problem browsers?
Code:
shadow: {enable:false, offsetx:5, offsety:5}, //enable shadow?
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