Scripted control of Wireless Connection

Is there a way, in XP, Vista AND Win7 (or several ways, perhaps) to control the SSID and connection type (specifically open or WPA-TKIP) of a Windows connection to an AP? What I'm attempting is to make a script that allows me to run it as user and in doing so, go from whatever my present wireless configuration is (probably Open unencrypted) to a connection using WPA-TKIP with a key embedded (encrypted) in the script, then back again by running the script with a different argument.

Thanks for any comments/suggestions