Pages are blank in Internet Explorer, but looks great in firefox

Hi,
I'm working on some portfolio updates for a company and I am just trying to update the code of a previous designer. The portfolio opens from a left nav link into a new (fixed-sized) window. In Firefox everything seems to be working great, but in Internet Explorer, even when I preview the pages individually, the page is completely blank... just a white screen. However if I go to view--> source all the page content is there.

I'm not a great programmer by any means, so I think I'm just missing a tag or something along those lines. I'm not really sure. If anyone has a chance to take a look I would really appreciate it.

market-shareinc.com (http://www.market-shareinc.com) click on the "portfolio" link.

Thanks in advance!

This is what i got. The images and content all popped up. I want to make sure this is the right page, but i am getting content.

Yeah that page works but try clicking on any of the categories. For some reason it seems like "audio" is the only one that works.

Yuo have a few validation errors you may want to correct and then see what happens. I dont see any major tags missing or anything. Im stumped why its doing that. Just try and fix some of the errors and see though.

Print page (http://validator.w3.org/check?verbose=1&uri=http%3A%2F%2Fwww.market-shareinc.com%2Fhtml%2Fportfolio%2Fprint_01.html)

yeah i thought that too. I fixed everything and it's still not working. I just didn't upload that version yet. I will do that now, but it's still not working.

hey. thanks for your help. I got it to work.
It had something to do with the CSS Styles in the header. I deleted them and made a separate style sheet and attached that to the templates, and now it seems to be working!