Split testing ads

Submitted by smile66603 on Sat, 05/31/2008 - 04:22.
I was wondering if there's a way to know which ad produced a sale or lead in Yahoo.
When I create a new ad group, I usually start with 4 ads and then after 2 weeks, I reduce it to 2 ads, and I usually do this based on the CTR and quality score. I know there's a chance a keyword with a lower CTR can have a higher conversion rate, so this method is definitely flawed, so it would be nice to know what ad a lead came from.
James

Optimize My Site does this.
Optimize My Site does this. We're doing a limited release of 2.0 June 6th (target date).
If you want to track it manually look for this parameter:
OVADID
or in other words....
<?php
$yahoo_ad = $_GET['OVADID'];
?>
Best,
Jeremy