wireless usb for canon camera?

I have a program that came with my Canon camera (S3is) called ZoomBrowser.
The program allows me ( with a USB cable--small fitting on the camera end;
"regular" fitting on the other... that plugs into my computer) ) to control
the camera's functions from ten feet away.

BUT..I have to run the cable outside... through window-screening etc. Is a
device made that will allow me to eliminate the cable over 20 feet or so?
If so, where might I find it; what is it called; and does anyone have an
idea what the approx cost would be to put together such a rig?

I'm a newbie at all of this ( as you can no doubt tell) ..

thanks very much. Rich