Lightbox disappearing in IE

I am loading my content through ajax and in the work section, once you click on a thumbnail highslide (lightbox i am using) works perfectly. when i test in IE7, the overlay appears but now my content in the back disappears and some random number comes up. I am completely lost on why this is happening :frowning:

here is my link http://avidgraphics.net/franchisestudios/fs/index7.html
here is the code i am using for my ajax links - http://avidgraphics.net/franchisestudios/fs/ajaxlinks.js

please test in IE7
click on work, slides over and select a thumbnail. - notice the number comes up and my content disappears argh!!!

please help!!
Thanks