mysite.com/intheviplink.php instead of
http://www.inthevip.com/main.htm?id=myaffid
Will not work because the inthevip.php file will still hae the html code with the affiliate code being rewritten by the toolbar...
However, encrypting the with javascript the link they will be clicking would work. Just be sure to make up your own algorythm since their tollbar might be able to check for various common methods...