Sorry I get it now. I read about DART, this is a js call.
In Flash:
var dartData = {x:"X",y:"Y",z:"Z"};
flash.external.ExternalInterface.call("myDartWriterFunc",dartData)
in Javascript:
<script>
<!--
function myDartWriterFunc(dartData){
// parse dartData if applicable
document.write('<script language="JavaScript"
src="http://ad.fr.doubleclick.net/adj/ts.psycho.com/homepage/index/sky
;kw=x;tile\=5;sz=160x320;ord='+jsDartRandom+'?"></script>');
}
//-->
</script>
