How to Remove HTML from tagline?

Got big troubles.
I backed up the data on my blog http://www.roastedtuesday.com/javajackpot/

Then I adjusted the tagline of the title and added an HTML line break.. And now.. WHOLE BLOG IS HOSED!

Some how, I got the site to at least have a text of the blog content but none of the style. If I try to go into the /wp-admin/ page. I get this message

Your data base is out of date. Please upgrade

When I hit the upgrade link, I get the following error and then this end of life message:

Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.
Please contact the server administrator, webmaster@roastedtuesday.com and inform them of the time the error occurred, and anything you might have done that may have caused the error.
More information about this error may be available in the server error log.
Additionally, a 500 Internal Server Error error was encountered while trying to use an ErrorDocument to handle the request.

I am the server administrator suggested and I have NO idea how to fix this.

I tried to find the file that has the <br /> in the tagline so I can just remove the offending code, but I just get php pages and I don’t speak php.

I tried reinstalling the style and then putting the data back. But I get the same thing again.

HELP!

Thanks
kerch