Wireless connection issue

Hello,

I have a small office system at home:

A.) PC (XP) DHCP - Wired
B.) PC (W7) DHCP - Wired
C.) Laptop (XP) DHCP - Wired/Wireless
D.) Laptop (XP) ?????? - Wireless
E.) ADSL Router
F.) Switch

So all wired devices A,B,C,E connect to the Switch, so there's internet access on all of them.

Laptop "C" and Laptop "D" already have a working connection in the sense of Wireless going (Laptop to Laptop WPA AES with SSID etc).

Now I want to connect Laptop "D" wirelessly to Laptop "C" so that Laptop "D" also has internet access AND access shared resources on "C". I tried sharing the LAN connection on "C", then assigning static IP to "C" WLAN connection. But somehow I dont get the IP's, the gateway or the DNS address right on both "C" and "D" to make this work. I used 192.168.0.1 on my WLAN "C" connection as IP.

Any ideas and solutions are very welcome ; including gateway IP suggestions and so on.
If it might help, my LAN wired connection is 192.168.1.xx with the ADSL router being 192.168.1.1 and as i've said before i set laptop "C" on static to 192.168.0.1.