prova a sostituire con questo:

<SCRIPT LANGUAGE="JAVASCRIPT">
<!--
var browName = navigator.appName;
var browDateTime = (new Date()).getTime();
var browVersion = parseInt(navigator.appVersion);
var ua = navigator.userAgent.toLowerCase();
var adcode='';
if (browName=='Netscape'){
if ((browVersion>=4)&&(ua.indexOf("mac")==-1))
{ document.write('<S'+'CRIPT src="http://www.adveurope.it/linkxpro/linkxpro.asp?Task=Get&Browser=NETSCAPE4&MemID=163& SzID=1">');
document.write('</scr'+'ipt>');}
else if (browVersion>=3)
{ document.write(''); } }
if (browName=='Microsoft Internet Explorer')
{ document.write('<ifr'+'ame src="http://www.adveurope.it/linkxpro/linkxpro.asp?Task=Get&MemID=163&SzID=1" width=468 height=60 Marginwidth=0 Marginheight=0 Hspace=0 Vspace=0 Frameborder=0 Scrolling=No></ifr'+'ame>'); }
// -->
</script>