moving wordpress 'up one level'

When I first started building my website I planned on using WordPress in a subdirectory for just the blog portion of the site. Having worked with WordPress for a couple of weeks I have decided to use it as the basis of the whole site. The problem now is that the URL goes to a directory that contains only an index.html file, an .htaccess file and, of course, the WordPress subdirectory. I am relying on redirecting to the WordPress subdirectory by using javascript in the index file, but that is slow and is causing formatting problems (i.e. the formatting looks fine in Firefox but is messed up in all other browsers).

It seems to me that life would be a lot simpler if WordPress was on the top level of the domain rather than in a subdirectory. How do I move it?

Thanks for any help.
Brian