sharing imac and ibook with cable modem

[gordens]

we just got a new ibook!  Our flat screen imac is connected directly to 
the cable modem.  My friend (in another state) told me that all we need 
to do is purchase a wireless modem (she bought net gear) to plug into 
the cable modem - and then get an airport/airport extreme card for the 
ibook.  THe ibook would then be able to share the cable modem with the 
imac.
Is this setup possible with all cable modem companies?
When I last checked, my cable modem company states that they charge 
extra $ per month for 2 machines to be using cable modem. So  - is 
there something unique about connecting wireless - that  you can share 
the cable modem?
Any  help welcome -before I call the cable company and end of spending 
more $.

Life's too short to drink bad coffee.....
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