check http referer

Javascript referer:

<SCRIPT LANGUAGE="JavaScript">
<!-- Begin
if (location.href.indexOf("dev") != -1){

document.write("thank you");
}
else {
document.write("Our new address is http://come.to/......");
}
// End -->
</SCRIPT>

Perlscript in ASP referer

<%$ReferringPage = $Request->Servervariables('HTTP_REFERER')->item;%>

Perl referer

if($ENV{'HTTP_REFERER'} =~/cgi\/cgi-shell\/esp\/adapter/)