Would this work?

Hi

I want to hide some affiliate links from google. Not too concerned about hiding it from humans or adwords (won't be using adwords). So, if I linked a banner to say ./redir.php and redir.php simply contains
redirecting to my affiliate link. Then use robots.txt to disallow redir.php, G should be blind to it. Right?

And yes, I know that code isn't valid, but my meaning should be clear.

wont work ...

Just use a redirect script to redirect your links.

do u have some example

hmmmmmmmmm