#clickTag DFP
#https://support.google.com/dcm/partner/answer/3145300?hl=en
<html>
<head>
<meta name="ad.size" content="width=300,height=250">
<script type="text/javascript">
var clickTag = "http://www.google.com"; </script>
</head>
[The rest of your creative code goes here.] </html>
Make sure your creative uses the click tag variable as the click-through URL:
<a href="javascript:window.open(window.clickTag)">
<img src="images/dclk.png" border=0>
</a>