PDF - Watermark Background in prologue.ps

Hey Guys!

I've come over a problem at my office! - We use to print (hardcopy) our documents on with our Company Logo pre-printed forms.
Now that staff is getting comfortable with e-mail internet and so on - finally - we more and more send documents via e-mail in pdf format.

Up to now I always was the one to include the Logo as background manually -but I'm gettin tired of it ...

I'm tryin to figure out, how I can include the Background during the pdf printing process...

I've tried to use Acrobat Distillers prologue.ps - but I can only go as far as a watermark - to stay realsitic ...

I would be gald if someone could help me with that! Thanks in advance!!