Sorry but this is pretty basic networking. Can I asked what happened to your IT staff?
On a small office setup we have many computers connected to one another using wireless LAN. One of the PCs on the WLAN also has a LAN connection with a few other equipment connected to it. The WLAN IP Addresses are 192.168.1.XXX and the LAN addresses are 192.168.0.XXX. How can I get to communicate the WLAN computers with the equipment on LAN.