Changing Root Directory

Hello,

I have a word press blog up and running in a subdirectory of my main site and I’m very happy with it. So happy in fact, that I’d like to scrap the site I’ve had up and running for a while and move everything over to WordPress pages with the main blog page as my home page.

Currently the WordPress lurks in http://www.mysite.com/wordpress

What do I need to change so that when anyone types in http://www.mysite.com they come straight to the front page of the blog? Are their any automated routines/plugins which will help me get there?

Sorry if this has been covered elsewhere, but I couldn’t find it.

Many thanks

Eddie