Step 1 - I have a desktop computer.
Step 2 - I have a CRT TV
Step 3 - I want to use the S-Video output.
The simplest way to hook up your desktop computer to you CRT TV using S-Video output is a single cable that will send both video and audio.
One end of this cable plugs into the S-Video output and speaker out on your computer. The other end plugs into one of the RCA video and audio inputs on your CRT TV.
You can also get the cables individually. If you have a S-Video input on on your CRT TV you can get a S-Video to S-Video cable like this.
S-Video cables come in various lengths from 6 feet up to 50 feet.