PHP chanllenge….

Anyone outthere who can sort this out?
I have worked with wordpress for some time now, know a little coding and have build sites in Go Live and Dreamweaver.
Now I try to help a freind with a theme she bought last year.
It has been modified by a guy that we seem to have lost contact with.
The url is: http://www.piya.dk/2010
The original menu has been replaced with a custum made one with thumbs that turns to sharp(from blur) on mouseover.
I was trying to add a page and a post, when suddenly the menu disappeared.
I guess that something must have altered a php in the header or… ??
I found the original header.php, replaced the “broken” one, and the header came back, but….

The thumbs in the menu stays blured.
I have tryed to replace parts of the php that apparently got broken(copyed the php before replacing it with the original..).
Can anyone help???