Cable net with different ip address.

Hi,
I am having cable internet and the gateway is 10.10.215.1, subnet mask is 255.255.255.128 . My lan is configured in 192.168.0.* and subnet mask is 255.255.255.0. I want to connect my internet cable in switch so that all an browse net. I can change my internal IP addresses.

Thanks in advance

Venkat