I broke my wordpress blog, please help

I was playing around on my wordpress blog, let's say it's located at www.mysite.com/blog

What I did was I accidentally changed the blog addressin the general settings to www.mysite.com

and now the pages of the blog still show up, but the pages just have content, and no theme. When I try to log back into my admin, I do get a login page (but with no theme)
and when I try to log in, I get a 404 page not found error. How can I fix this?

Thanks, Ron

Just sent you a PM

Look at your MySQL Database at wp_options for "siteurl" and "home" and check if the two values are correct.

Thanks Guys, I'll give it a try

A safety tip folks - get the free WP DB Backup, and before you add plugins or mess with the configuration, run the backup. If anything goes wrong, you can get back in business almost immediately by simply restoring.

What I do is use phpMyAdmin to create a duplicate database. If I am going to do a major update, throw in some plugins, or try out some experimental stuff I dupe the DB - keeping the same DB user and password in the second DB. That way, if anything goes wrong, I simply go into the WP config file and change the database name.