Help with cross-over cable connection

[pkaplan1]

I am planning to attach an old wireless router to my home network to serve as 
a second access point and as a switch.  Once I get to the router's config page, 
I know I can turn off DHCP so that it doesn't conflict with my home network and 
set a new IP address, but at the moment the old router's IP address is the 
same as the new router's IP address so unless I shut down my network, which 
I'd rather not do, I can't connect both routers to the network at the same 
time.

How can I get to the old router's config page using a crossover cable?  Is 
there a gui tool for this?
TIA
Paul