Adding Javascript Ad Code Above Header

I have no experience with CSS or PHP, but I’ve been messing around with both in the last couple of days. I’m trying to ad the code below above the header here:
http://www.meshsf.com/blog1/.

Like this site has here: http://www.stereogum.com/.


<script language='JavaScript' type='text/javascript'>
<!--
if (!document.phpAds_used) document.phpAds_used = ',';
phpAds_random = new String (Math.random()); phpAds_random = phpAds_random.substring(2,11);

document.write ("<" + "script language='JavaScript' type='text/javascript' src='");
document.write ("http://campaign.indieclick.com/adjs.php?n=" + phpAds_random);
document.write ("&what=zone:274");
document.write ("&exclude=" + document.phpAds_used);
if (document.referrer)
document.write ("&referer=" + escape(document.referrer));
document.write ("'><" + "/script>");
//-->
</script><noscript><img src='http://campaign.indieclick.com/adview.php?what=zone:274&n=ae1dd888' border='0' alt=''></noscript>`

I tried searching in the forums, but the only advice that seems related is “just put the code where you want it to appear” and “put it in header.php,” both of which are too vague for me. Is it possible just to dump that code somewhere, or do I have to add more code to it?

And if I am in way over my head, you could let me know that too.

Thanks a lot,
Brian