Make sure the wireless router is set up as a gateway, as opposed to a router. It\'s usually in setup->advanced options, but it depends on the brand your wireless router is. You will end up with a router and then a wireless hub/switch.
Basically, you have to set the wireless router up with a static IP (like 192.168.1.5) and make it\'s default gateway your other router (192.168.1.1). Enable DHCP on the wired router (unless you feel like assigning all your IPs) and disable on the wireless.
This Guy has some other ideas/explanations. I don\'t like the way he does it, but it probably works.
I still always go for non DHCP setups, once you get this working it\'ll be nice and stable.