Setting up a LAN | iMac eMac | wireless router

G'day everyone.
I have just bought a wireless router and I'm hoping I can use the Internet on two computers, and be able to move files from one to the other.
Here's what gear I have:
iMac with OSX 10.5.2
eMac with OSX 10.3.9 (no wireless facility)
Belkin wireless G router
cable modem
I have the eMac hooked up to the router with an ethernet cable, and the iMac using Airport. The Internet is working on both computers.
So, can I create a LAN so the computers can talk to each other too? Is that a complicated job?
Thanks in advance.
Nolan

Sorry, if I was jumping the gun. It is difficult to judge user skill-levels here and it looked as if you were well on the way.
To make sure they are on the same netowrk, open System Preferences in each of them and click on Network. The panel shows to the left, the types of connections (Ethernet, Airport, etc.). The active network should be at the top and with a green "light" next to it.
To the right of that you will have the fact that they are connected and ". . . has the IP address x.x.x.x", perhaps something like 10.0.0.3 or 192.0.0.5. If the computers are on the same network, they will all have numbers in that same series. In other words, if three have 10.0.0.x and one has 192.0.0.x that last one is not on the same LAN.
For more information about the network, click on the Advanced button at bottom right of that panel, then click on the TCP/IP tab. In there, you will see in addition to that computer IP number, the IP number of the router.
If any computer is showing a number that begins 169. . . . that is not connected to the network and has a self-assigned IP number.
Check your IP numbers first, then we can look at connections or any changes that need to be made.
You can get some more information

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