Linksys Wireless Router :: Getting WAP54g To Repeat (extend) Signals

At one of our offices, we have a Cisco ASA5505 firewall that has dhcp enabled. I have a WRT54G router plugged into that firewall with DHCP enabled. The scope of our inside network is 192.168.51.***, however when connected to the WRT54G, it gives you the scope of 192.168.1.***We have an antenna amplifier screwed into one of the antenna ports on the router. This whole setup works fine.
 
 The problem is we need to install an access point WAP54G in a building across the property (picks up router wireless signal fine) to repeat the wireless signal to the back of the property where the router will not reach. I have read that all you need to do is type in the wireless mac address of the routher into the access point and select "Wireless Repeater". I have the channels set to 6 on both devices as well as the same security configuration. When I try to connect to the wireless network on the access point, It never gives me an ip in the 192.168.1.*** scope, which the WRT54G is configured to give out. Also, in this setup does the WRT54G need to be set to router or gateway mode? I do not need it to distribute ip addresses. [code]