Printing from mozilla with cups

[Glenn Meehan <glenn.meehan@swiftdsl.com.au>]

Hi,

I am having a problem printing from mozilla.

This is what I am doing:
File -> Print 
I then select postscript-default for printer.
Under properties I am using lpr as the print command.
I then click the print button.

My printout contains lots of little rectangles where characters should
be.

I am using debian testing/unstable.
mozilla 1.5
cupsys/testing uptodate 1.1.20final-16
kdebase/testing upgradeable from 4:3.1.3-1 to 4:3.1.5-2
The printer I am using is a HP laserjet 5L (non postscript)
Printing from open office and lpr on the CLI all printout properly.

How can I rectify this problem?

Thanks