Hm, that link is not working. Is the site up? z-index issues are usually pretty simple to fix.
Edit: OK, it's working now. (Took a few tries.)
Try bumping up the z-index on the section (around line 53 of the CSS):
z-index: <font color='"#FF0000"'>100</font>;
background: url(../images/content.gif) left top repeat-x #FDFDFD;
border-bottom: 1px solid #E8E7E6;
padding: 35px 0;