This is a little thing I threw together this morning to defeat popup blockers for popups and popunders...
Popunder Example
Code:
<form name="foo" id="foo" target="_blank" method="GET">
<!-- ... -->
</form>
<script>
var myurl = "http://www.trafficseller.com/blind.cgi?ref=my_account";
document.foo.action = myurl;
onload=document.foo.submit();
document.self.focus();
</script>