Latitude D620 - Using ICS On A Wireless Connection?

I have a Dell (Latitude D620) with a wireless connection and a RJ-45 network connection. I use my wireless for my internet connection, and want to allow other computers (on the wired network) to share my wireless internet connection. The problem is that all forums I have found merely say "click the enable connection sharing checkbox". This does not work, as that option is not available on my wireless conn. It is available on the wired conn. I also received a message saying that the connection wizard can only be run as network administrator. I have a home network...I am all the administrators. I am using Intel PROSet/Wireless for my wireless connection.