Deciphering CSS in Firefox/IE

I’m having a bit of a problem, like most, about customizing CSS and having it work both in Firefox and IE. First off I know CSS well and been using it for a few years but lately I’ve become baffeled. I switched my site over to WP and created a custom template with corresponding css. Up till yesterday my site was viewable both in Firefox and IE, but now Firefox views the page without a key wrapper.

I have a wrapper that contains the background for my sidebar, which is in two colors. IE views the page fine, but Firefox just displays a white background. I didn’t edit any of my CSS, though I tried cleaning up some code in the sidebar. However, even removing all the code in the sidebar and leaving the two divs I still recieve a white background. Can someone please look over my site and see as to why this is happening?

Usually I have problems with IE not creating a page correctly, but now the opposite with Firefox and this perplexes me. BTW I’m using the Falbum plug-in in the sidebar.

thanks

http://www.traderelic.com