CentOS 4.5: Print on custom paper size?

[Brad Beyenhof]

I'd like to print on an index card. My printer (an HP LaserJet 2100) 
supports it, but I can't figure out how to get a 3x5 inch option in 
CentOS's "Printer Properties" dialog.

Thanks for any help or direction that can be provided!
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Brad Beyenhof
Systems Administrator
UC San Diego, Laboratory of Cognitive Imaging

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