Linksys Wireless Router :: Using Old WRT54GS As A Range Extender?

I first want to say I "think" I might be posting in the wrong forums for this question, but because I'm not really sure what the proper terminology for this is, I thought it best to ask here.
 
I have recently upgraded my router for my home network from an old Linksys WRT54GS G router, to a new E2500 N router.  I have heard/read that it is possible to reconfiqure my old router to act as a range extender for my network but I am unclear how to do so.  I think this may be the same thing as an access point, but all the FAQ's I've found seem to have this work as a solo device, not as a device on existing network.  I have my e2500 setup with the modem in my study and broadcasting from there, and would like to use my old G router set up as a range extender to be located in the front living room area and picking up the network signal and rebroadcasting from there without a modem or computer attached.