As Peter says, using a broadband router is exectly how most broadband internet pcs are setup.
Do you want the PCs on the 192. network to access the 10. ?
Then you would need a regular router without the NATing that your average broadband router provides.

Funnily enough, I am about to switch out my Linksys for a 333 pentium running Mandrake Multi Network Firewall so I can do a combination of some NAT/ no access and restricted wireless routing.