function fillhidden(mail_to,mail_from,mail_subject,mail_return) {
  if (document.forms[1]) {
    if (document.forms[1].x_twp_mailer_script_to) { document.forms[1].x_twp_mailer_script_to.value=mail_to; }
    if (document.forms[1].x_twp_mailer_script_from) { document.forms[1].x_twp_mailer_script_from.value=mail_from; }
    if (document.forms[1].x_twp_mailer_script_subject) { document.forms[1].x_twp_mailer_script_subject.value=mail_subject; }
    if (document.forms[1].x_twp_mailer_script_return) { document.forms[1].x_twp_mailer_script_return.value=mail_return; }
  }
}