My site was hacked with spam script

i had outlaws gameroom running fine for a while using php fusion, i dont know how the hell the do it, but somebody inserted a spamming script on my pages, it was verified by my hosting, that it was sending out Spam, i cant prove it, but i think it was one of those infusions i downloaded and installed on my site, i mean how else could a jackass sabotage somebodys website, right? I'll hand it to the **** that was genius enough to screw my site up, YOU
F***ing suck, this thread will probably get my banned, but hell i dont give a rats ass, YALL F***ed my site anyway and did a marvelous job at it too, The Outlaws middle finger is up in the air for you creeps, F*** that have both middle fingers, any blue collar webmasters on here reading this? be careful with what you install, these are some smart ****s, they will F*** you and your site and not even bat an eye when they do.

OUTLAW is F***ing outta here

/Edited thread title to reflect issue/Richard