REALLY weird problem!

I was messing around with the wordpress writing section in dashboard to set a category page as the main page when people log into my site..and now I don’t have access to my dashboard anymore! Looking at the site, phitlab.site40.net/wordpress, it looks like the theme has dissapeared and everything looks really strange..I changed the writing section back to the original and saved it, but I still can’t do anything else on the dashboard. If I refresh the page, it takes me to the main page, but it’s all messed up! As you can see.

Can someone tell me what’s going on? o_o