Linking to my site with a ?var=val style url (Solved)

[eluser]laytone[/eluser]
I have an affiliate site (clickbank) linking to my site.

When somebody click on clickbanks affiliate address link it hops them to my website like this:

http://mysite.com/?hop=affiliateid

Of course this is throwing a 404. I don't need the hop variable they send it in case I need but they send it no matter what. What can I do? Can i set up a rout that will just redirect them to my home page. How would I do this correctly?

Thanks in advance.

Layton