Creating A WP Theme Demo Site

I am in the process of creating a WordPress theme site. The idea is as I am sure you have seen to have people visit mysite.com and click on a theme to demo. Once this happens, they would see mysite.com/theme1 then click to see mysite.com/theme2 etc. Simple concept.

Now my question is, is there an easy way to build the site so that i don't have to have multiple installs of WP? I know that I can run it off of one DB no problem but I would obviously like to avoid a 5mb install for each theme demo. Thanks!

I figured it out so thanks anyway. Here is how to do it if you want to do this for yourself (just install the plugin)

theme viewer.. is what I remember, try to wp extend and you will find it..

Jagged55, thank you for the link!

This plugin should do it also.