Using an existing image as a watermark

[Coleen]

Hi All

I've done a couple of searches but don't see anything on what I wan to do so here goes:

I have an image I need to use as a background/watermark image. The image is in color but needs to be a black & white watermark behind a lot of text on a PDF document I'm creating in Xara Designer Pro 7 (I know I need to upgrade and will as soon as I can afford to) but in the mean time can any one tell me if or where there are any examples or info on how to do this?

Thanks!