PHP Testing Server Question (using IIS)

Okay, so I've been trying to set up a local testing server using PHP and
IIS. It works fine. The problem, as you'll understand if you're experienced
with this, is to set it up so images show up using root relative links. I
have the site in a virtual directory but of course root relative links won't
work. I found a post where Kindler recommended changing the IIS default home
to the root of the site I'm working in, but I'm often working on several
sites simultaneously and that's a huge pain to change the default home every
hour or so. Does anyone have another solution?

Thanks!
Mad Dog