function write_ref(min, exp, lim) {
   document.write("<script language='JavaScript' type='text/javascript' src='http://www.python-cgi-programming.com/CGI/ReferrerList.cgi?out=" + document.location + "&min=" + min + "&exp=" + exp + "&lim=" + lim + "'>");
   document.write("</");
   document.write("script>");
}