Turn off Duolex Printing for Envelope

[Frank C.]

My printer (HP 1315) is set for duplex printing to save paper.
When I print an envelope in word (2003) there is no opportunity to unckeck
Duplex in
Properties > Features like there is for a document. Consequently, it always
feeds a blank page.
It seems as though duplex should be automaticaly turned off for an envelope.
Any ideas?
Regards
Frank C.
WinXP SP 2