image checker script?

[ThaMATRiX]

anyone know of a script, so I can give free hosting, (in cPanel), and require that all websites have a image with a link we require in them? so basically it can search through a list of sites, check the source code, make sure it includes certain code, if it doesnt then it will let me know? Thanks.
I wanted to require a little Powered by... button on sites. Thanks.

[ThaMATRiX]

Maybe it even suspends the sites if it doesnt have the code?
(im saying code, so it can be changed, either a cetain image, or maybe just a required text link?)