Adding Linksys WRT55AG into bussiness network

The ideal setup would've been to use a 'Access Point' rather then a 'Router' to integrate into in an exsisting network. However, I am just trying to see if I can get this Router to work current in our current network/domain.

Domain Network - (DLE)
Gateway 162.87.106.1 255.255.255.0
Dns - 162.87.106.5


Linksys Router settings:
Domain: DLESC
Connection type: Static IP
Internet IP address: 162.87.106.1
Subnet Mask: 255.255.255.0
Default Gateway 162.87.106.1
DNS: 162.87.106.5
Lan IP: 192.168.1.1
Subnet Mask: 255.255.255.0

The reason we wanted to try this router is because we would like to have the DHCP assign a different address range rather then use the 162.87.106.xx because we are running low on addresses. Everything appears to be working, Internet, Logging into the Domain, we can see the intranet, etc. The one thing that we cannot get working is when you go to : My Network, Entire Network, Microsoft Windows Network - then you will see the domain DLE listed, but if you click on that, you don't see all the computers that you normally would if you were on the same network ID. However, you can get to those machines if you know their friendly name or ip address. Is there anyway to get the networked computers to show up in the list? The other thing we noticed is that when your on the 162.87.106.xx network and you can see the computer name logged onto the domain, you cannot get to that computer's resources or shared files. I know that their 192.168.1.x ip isn't being routed, but how can I get that ip range to resovle to the Domain? I'm new at this so any help would be great!

Thanks,

Swifty