Tracking clicks into framed content
 

I'm looking for a way to track clicks into framed content so I can do keyword analysis. I don't have control over the content in the frame so I can't put tracking code there. Basically I just need to know the keyword phrase they came in on and that they clicked on the frame. It won't be perfect but it will give me more detail than I have now. Can someone recommend a (hopefully inexpensive) way to do this?

Thanks,
Paul