Wireless Router Connected To internet Through Switch

I recently bought a Netgear WGR614 Wireless Router. It’s connected through a Linksys 24 port 10/100 Base T Switch, Which is in turn connected to our ISP. I had to order a special IP that went around the firewall, without it I would get an error saying that I entered an invalid gateway. The computers on the network can connect to the router fine, but they have “limited or no connectivity” they cant access a single website. I want to use DHCP on the router and use it solely for wireless access, the rest of the users on the network are connected directly to the Switch and have manually configured IP’s within the firewall.

Can anyone help me out with how to get this router to work properly?