I have two network setup in my office
 

I have two network setup in my office

1st floor 192.168.1.0 series and internet gateway 192.168.1.1.
3rd floor 192.168.2.0 series and internet gateway 192.168.2.1.

now I want interconnect these two network so that they can share information and also they can access internet with their respective gateway.

please guid me to configure this setup.

waiting for your reply.

Thanks in advance

You need give a lot more information about the physical layout.
A few things to start with:
* Are the two "internet gateway" connected?
* Do they share the same internet connection, ie is there a third router in front of them?
* Are there firewalls on the gateways?