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>