Cisco Switching/Routing :: 2970 / Routing To Internet Through Different VLan?

We have 2 internet connections- one for production and one as a backup.  The backup connection will be used for allowing guest visitors on a wireless network that is on a seperate VLAN.
 
We have the following networks:
 
VLAN 1 production, 192.168.1.0
VLAN 10 backup internet connection, 192.168.100.0, Interface 100.2
VLAN 41 wireless guests, 192.168.41.0, interface 41.1
 
VLAN routing provided by Dell 6224 switch and other switching is Cisco 2970 (L2) switches.Backup Internet router is SMC (Comcast)
 
I would like to allow clients on VLAN 41 access the internet connection in VLAN 10 at 192.168.100.1.  Clients on VLAN 41 can PING and trace to the default gateway 100.1.  VLAN 41 clients are also able to get DHCP info from VLAN 1.  NSlookup fails when using the ISP DNS servers.  NSlookup is suscessful when using our internal DNS servers, but web pages are not returned.  It eventually fails.We've tried to set the DFGW on the clients to both 41.1 and 100.1 with no success.
 
100.2 know where to find 41.1 interface for the 41.0 network. The router/gateway can PING the clients on VLAN 41, 192.168.41.0 network and visa-vera.
 
It seems like the clients are not able to get through 100.1 to the internet or the gateway/router doesn't know how to get packets back to the clients.A static entry was made on the router that mapped back to the next hop at 100.2.  1 Someone alluded to a NAT issue, where the returning packets have information for the 100.0 network only and the internet router doesn't know to send the packets through to the 41.1 interface to the clients.