Print Sharing Problem

[Seymour J. Wolfson]

I have a PB 17" and running OS 10.2.8.  Also have an iMac at home also
running the same OS. The iMac is connected to a printer via an ethernet
connection thru an Airport base.  I have set up the iMac so it has Printer
Sharing on.  Sometimes when I use my PB with an Airport network connection,
it is able to print.  Other times it cannot see the printer.  Can someone
explain what is going on and how can I get my PB to print without such a
hassle.
Frustrated.
-- 

Seymour