Don't worry, I did it myself! Here it is - if there's a better way, I'm interested! Cheers Francis ____________________________ <script type="text/javascript"> function formcheck() { if (document.letter1.userurgent.checked) { document.all.addresscheck.href="mailto:urgent at bar.com"; } else { document.all.addresscheck.href="mailto:normal at foo.com"; } return false } </script>