function revert() {
  changeColour('#158190');
}

  function sendMessage() {
    frm = document.contact;
    if (frm.visitor == null || frm.visitor.value.length == 0) {
      alert('Please enter your name before sending');
    } else if (frm.visitormail == null || frm.visitormail.value.length == 0) {
      alert('Please enter your email address before sending');
    } else if (frm.attn == null || frm.attn.value.length == 0) {
      alert('Please enter a subject before sending');
    } else if (frm.notes == null || frm.notes.value.length == 0) {
      alert('Please enter a message before sending');
    } else {
      frm.submit();
    }
  }