probably something simple

how do i get google analytics to detect traffic that comes from a website that redirects to another?

i.e

someone visits www.abc.com, and are redirected to another site

<?php header("Location:www.cde.com"); ?>

how do i track these hits? nothing comes up..as i guess it's not strictly a "referrer".

hope this makes sense..thanks

or is there a better way to do this? I want to track hits on anyone visiting domain X, which redirects to another site. Essentially we are doing a radio campaign with this new domain and would like to measure its effectiveness.

thanks