Lower printings

[i386DX]

I have an Oki B4100 printer, which works with the Oki B4200 driver. (its a ppd-file).

There's only one annoying problem: all printings are too high on the paper (upper margin is smaller, and at the bottom there's a biggerone). Is there a way to give an offset or something like that via cups or maybe in the ppd. The print should be about 0,5cm lower.

I don't know if it's relevant, but this is the driver i use:
http://belgium.oki.com/binaryData/6683/ok4200pcl.ppd.gz