long ref-codes is no problem. You can use mouse-hideovereffect or just use redirection codes on your domain if you have that feature at your host (like cPanel etc.)
What is important (from the affiliates point of view) is to set the cookie at once, before they surf further from a single picture.
I talked to another webmaster regarding this, and he used a script that set ALL his ref-codes when they surfed at his sites, overriding others codes. He would not show me how
