How do i reverse a graphic

I have a graphic of a Arabic word (attached) I would like to reverse. I need white letting on black or transparent background. Can some one point me to a tutorial to do this or if it's simple tell me, bearing in mind I have little experience with PS.

Thanks,

Steve

P.S. I guess you can't attach files here.

just a minute ill be back

here are a few tuts, it is a very simple procedure
http://www.google.com/search?client=safari&rls=en&q=text+reverse+it+in+photoshop&ie=UTF-8&oe=UTF-8