z-index issue, I am using your theme and ajax_register module Version 1.3. This causes problems with the z-index. The thickbox from the ajax-modul will not be displayed correct.

This is concerning your style.css file. Look at #

line 505

#header-bottom {
margin: 0 auto;
position: relative;
width: 960px;
z-index: 99;
}

your original z-index was about 600 and the ajax_modul uses z-indexes about 100+. Please consider this in your future updates.
For this case I changed it to a value below 100, but maybe there are much better solutions.

Thanks

Katasun