#1 need to know which MacBook Pro you have, or at least which connection is on your MBP
If you have one with the mini-display port, don't know that you'll be able to get an S-video or composite output.
To even try, you will need Apple's mini-display port to VGA adapter.
That will need to be connected to a converter box. You might try something like
this.
Note: Apple's VGA to video adapter does not work according to almost all reports.
There have been many issues surrounding getting the mini-display port connected to analog monitors with a fair amount of users having no success.