<script>
function sendmail_nospam (user, domain) {
   var p = "\u006d\u0061\u0069\u006c\u0074\u006f\u003a";
   var u = user;
   var d = domain || location.host.substring(location.host.lastIndexOf(".",location.host.lastIndexOf(".") - 1) + 1);
   str = u + "\u0040" + d;
   void(top.location = p + u + "\u0040" + d);
}

function printmail_nospam (u, d) {
   document.write (u + "\u0040" + d);
}
</script>

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<A href="javascript:sendmail_nospam('my_mail', 'my_domen.ru');"><script>printmail_nospam('my_mail', 'my_domen.ru')</script>
</A>