function check_ad() {
 if (document.ad.fname.value=="") {
  document.ad.fname.focus();
  alert("Enter FULL NAME, please!");
  return false;
 };
 if (document.ad.email.value=="") {
  document.ad.email.focus();
  alert("Enter E-MAIL, please!");
  return false;
 };
 if (document.ad.phone.value=="") {
  document.ad.phone.focus();
  alert("Enter PHONE, please!");
  return false;
 };
 if (document.ad.spec.value=="") {
  document.ad.spec.focus();
  alert("Enter SPECIALISATION, please!");
  return false;
 };
 if (document.ad.text.value=="") {
  document.ad.text.focus();
  alert("Enter TEXT, please!");
  return false;
 };
 if (document.ad.contacts.value=="") {
  document.ad.contacts.focus();
  alert("Enter CONTACTS, please!");
  return false;
 };
 document.ad.submit.value="Submitting...";
 document.ad.submit.disabled=true;
}