account creation change field text

Hi, when a customer checks out and creates an account or uses the guest checkout i would like the telephone number field to display (landline telephone number) can anybody point me in the right direction of changing the field telephone number to landline telephone number? would this have to be done in multiple areas?

thanks ahead
Rich
The Gadget Shack

catalog/language/english/account/create.php
catalog/language/english/account/address.php