Nice website you've got there. Clean and simple navigation (reminds me of Deviantart's for some reason), but one thing I'd change as soon as possible is the fact that if I have javascript off all your navigation goes to hell and I can't go anywhere. Create a browse.html file and link it from the Browse menu item. On the browse.html get links to all categories and subcategories.
Also, and as stated above, remove the ads. It makes your site look unproffesional, unattractive and ugly; not to mention they are annoying. I'm currently here:
http://www.socwall.com/browse/index....&wpQueryType=1
And I got one big yellow/orange add on top and at the bottom of the page, and one big ugly google ad at my right. Dude, that sucks. It screws your design.
Finally, a script to cut images or something (something like this:
http://www.marqueetool.net/ ) would be awesome for people who don't want a full 4mb file.
Good job on that site!! Keep it up!!
Jam it back in, in the dark.