You should have received some code from Falk that looks like one of the following:
<script type="text/javascript" language="javascript" src="http://a.as-eu.falkag.net/dat/dlv/aslmain.js">
</script>
<script language="JavaScript" type="text/javascript">
Ads_kid=0;Ads_bid=0;Ads_xl=0;Ads_yl=0;Ads_xp='';Ads_sec=0;
Ads_yp='';Ads_opt=0;Ads_wrd='';Ads_prf='';Ads_par='';Ads_channels='';
</script>
<script type="text/javascript" language="javascript" src="http://a.as-eu.falkag.net/dat/cjf/00/23/16/45.js">
</script>
<script type="text/javascript" language="javascript" src="http://as1.falkag.de/sel?cmd=jsc&kid=01434324&dat=0435435&xl=120&yl=60&opt=0&rdm=[timestamp]">
</script>
<noscript>
<a href="http://as1.falkag.de/sel?cmd=lnk&kid=01434324&dat=0435435&opt=0&rdm=[timestamp]" target="_blank">
<img src="http://as1.falkag.de/sel?cmd=ban&kid=01434324&dat=0435435&opt=0&rdm=[timestamp]" width=120 height=60 alt="" border=0>
</a>
</noscript>
What you need to do is modify the URLs in the <SCRIPT>, <IFRAME>, and <A> tags like this:
<script type="text/javascript" language="javascript" src="http://a.as-eu.falkag.net/dat/dlv/aslmain.js">
</script>
<script language="JavaScript" type="text/javascript">
Ads_kid=0;Ads_bid=0;Ads_xl=0;Ads_yl=0;Ads_xp='';Ads_sec=0;
Ads_yp='';Ads_opt=0;Ads_wrd='';Ads_prf='';Ads_par='';Ads_channels='';
Ads_cnturl=unescape('%%CLICKTAG%%') + '[url_plain]';
</script>
<script type="text/javascript" language="javascript" src="http://a.as-eu.falkag.net/dat/cjf/00/23/16/45.js">
</script>
<script type="text/javascript" language="javascript" src="http://as1.falkag.de/sel?cmd=jsc&kid=01434324&dat=0435435&xl=120&yl=60&opt=0&rdm=[timestamp]&cntadd=1&cnturl=%%CLICKTAG%%">
</script>
<noscript>
<a href="%%CLICKLINK%%http://as1.falkag.de/sel?cmd=lnk&kid=01434324&dat=0435435&opt=0&rdm=[timestamp]" target="_blank">
<img src="http://as1.falkag.de/sel?cmd=ban&kid=01434324&dat=0435435&opt=0&rdm=[timestamp]" width=120 height=60 alt="" border=0>
</a>
</noscript>