domain redirection ?

[Zab]

Hi All

My Bind v9.2.3 DNS handles 2 zones in two different domains. An old one, and 
a new one - and
we want to have a transitional period before migrating from the 1st to the 
2nd.

Let's say we have following dns files

old-domain.dns
new-domain.dns

The prupose is to redirect user requests : www.old-domain.com should be 
answered with www.new-domain.net ip address.

Is it possible to do that ?
How ?

Thank you for your help

Zab :-)