Stealth Redirect

Guys,

Really busting my head on this. I'm sure it's just a stupid problem, but for some reason I don't know how to overcome this.

How do I know where a person is coming form when using a stealth redirect?
I have a domain that "hides" my affiliate tags, but every time someone clicks through that link, I have no idea where they came from.

instead of www dot site dot com with my affiliate link embedded, I have www dot join site dot com.
Using this method I can't change my affiliate link.

Any suggestions?

prob could put some tracking code on the landing page if its yours

I would recommend extreme conversions

If they are simply being redirected then XC takes care of this for you when you generate the code

oscar

There is no landing page. They're simply being redirected.
Are there any other options, besides extreme conversions?
I was thinking more in the lines of something free or maybe just a script that I'm unaware of.