Hi Ofi,
No problem. I’m not familiar with fgallery so I don’t know how it may be changing your page template.
I’ve looked again at your site and it definitely looks like the markup that is causing the errors is probably generated by your gallery plugin.
I notice in Firefox, it even breaks the content area so it’s not showing the correct white background and your sidebar is shoved to the bottom of the page. Fixing these paragraph issues should straighten it out, though.
You’ll probably want to check with the gallery’s website and developer to see if you can figure out where you can change this markup. As I mentioned in my email, I’d be happy to take a look at the gallery files for you if you’d like.
If you check with the plugin site/developer and don’t get any help, feel free to contact me and I’d be happy to take a quick look at the files for you.