I'm not entirely certain why, but your page doesn't work at all except in IE. This is probably because there is something native only to IE that is used by your menu.
Then, in IE, when I went to load your page, it wanted to open a PDF. I aborted that, but it was annoying. Then I finally did see the issue you are talking about.
Here's what I would suggest, first get rid of the PDF or make it something the user may click on only if they choose to, second fix that menu. Third, since you are loading up dynamic content anyway just to expose the iframe with the problematic lightbox in it, why not use either a lightbox that is on the page itself, or even imported via AJAX. If you want to go the AJAX route, use an AJAX friendly version of lightbox like 2.04a:
http://www.dynamicdrive.com/forums/s...470#post163470
Either way, the lightbox would then have the entire page to display over, so would be much less likely to have a horizontal scrolling issue. If your thumbnails were in a division with a set width and height with overflow auto, they could still exhibit a scrollbar like they do now. Something like:
HTML Code:
<div style="width:400px;height:350px;overflow:auto;">
<div style="width:600px;">
Thumbnails here
</div>
</div>
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