You should have received some code from AdvertPRO that looks like the following:
<!-- BEGIN ADVERTPRO CODE BLOCK -->
<SCRIPT language="JavaScript" type="text/javascript">
document.write('<SCR'+'IPT src="http://www.example.com/advertpro/servlet/view/banner/javascript/zone?zid=7&pid=0&random='+Math.floor(89999999*Math.random()+10000000)+'&millis='+new Date().getTime()+'" language="JavaScript" type="text/javascript"></SCR'+'IPT>');
</SCRIPT>
<NOSCRIPT>
<IFRAME src="http://www.example.com/advertpro/servlet/view/banner/html/zone?zid=7&pid=0" height="600" width="120" hspace="0" vspace="0" frameborder="0" marginwidth="0" marginheight="0" scrolling="no">
<A href="http://www.example.com/advertpro/servlet/click/zone?zid=7&pid=0&lookup=true&position=1" target="_top">
<IMG src="http://www.example.com/advertpro/servlet/view/banner/image/zone?zid=7&pid=0&position=1" height="600" width="120" hspace="0" vspace="0" border="0" alt="Click Here!">
</A>
</IFRAME>
</NOSCRIPT>
<!-- END ADVERTPRO CODE BLOCK -->
What you need to do is modify the URLs in the <SCRIPT>, <IFRAME>, and <A> tags like this:
<!-- BEGIN ADVERTPRO CODE BLOCK -->
<SCRIPT language="JavaScript" type="text/javascript">
document.write('<SCR'+'IPT src="http://www.example.com/advertpro/servlet/view/banner/javascript/zone?zid=7&pid=0&random='+Math.floor(89999999*Math.random()+10000000)+'&millis='+new Date().getTime()+'&encode=1&cturl=%%CLICKTAG%%" language="JavaScript" type="text/javascript"></SCR'+'IPT>');
</SCRIPT>
<NOSCRIPT>
<IFRAME src="http://www.example.com/advertpro/servlet/view/banner/html/zone?zid=7&pid=0&encode=1&cturl=%%CLICKTAG%%" height="600" width="120" hspace="0" vspace="0" frameborder="0" marginwidth="0" marginheight="0" scrolling="no">
<A href="http://www.example.com/advertpro/servlet/click/zone?zid=7&pid=0&lookup=true&position=1&encode=1&cturl=%%CLICKTAG%%" target="_top">
<IMG src="http://www.example.com/advertpro/servlet/view/banner/image/zone?zid=7&pid=0&position=1" height="600" width="120" hspace="0" vspace="0" border="0" alt="Click Here!">
</A>
</IFRAME>
</NOSCRIPT>
<!-- END ADVERTPRO CODE BLOCK -->