Netgear WGR614 NAT Problem

Here's the scenario:

I have 1.5 mbit DSL internet connection and this wireless router. in my house i have several PC's, one of them is a linux server serving many websites, DNS, etc. This server is configured in the router as a DMZ server and i can access my websites without any problem.

I have a laptop so, sometimes i'm inside my house and sometimes i'm outside my house. When i'm out, i open my browser and type my webserver address (www.myserver.com) and everything works fine, but inside my house if i type my webserver address (www.myserver.com) the browser goes to timeout and give me an error, basically the browser cannot connect to the server.

Prior this router i had a Linksys router and my webserver works with its name (www.myserver.com) no matter where i was, inside or outside my home network.

Any ideas?