What does thi script do?

[hiphop]

I kept seeing a strange overture in the bottom of my browser when a page loaded so I looked at the code and saw this. What is it for?
<script language="JavaScript" type="text/javascript">
<!--
ctxt_ad_partner = "5885872630";
ctxt_ad_section = "45517";
ctxt_ad_bg = "";
ctxt_ad_width = 120;
ctxt_ad_height = 240;
ctxt_ad_bc = "ffffcc";
ctxt_ad_cc = "ffffcc";
ctxt_ad_lc = "da9505";
ctxt_ad_tc = "000000";
ctxt_ad_uc = "254579";
// -->

</script>
<script language="JavaScript" src="http://ypn-js.overture.com/partner/js/ypn.js">
</script>
<br>
<script language="JavaScript" type="text/javascript">
<!--
ctxt_ad_partner = "5885872630";
ctxt_ad_section = "45517";
ctxt_ad_bg = "";
ctxt_ad_width = 120;
ctxt_ad_height = 240;
ctxt_ad_bc = "ffffcc";
ctxt_ad_cc = "ffffcc";
ctxt_ad_lc = "da9505";
ctxt_ad_tc = "000000";
ctxt_ad_uc = "254579";
// -->
</script>
<script language="JavaScript" src="http://ypn-js.overture.com/partner/js/ypn.js">
</script>

[blank]

thats YPN.... replace it with your own ad spot or just delete it