function checkData(){
Ime = document.Kontakt.Ime.value;
  if ((Ime=="")){
  alert("Please, write your Name");
  document.Kontakt.Ime.focus();
  return false;
 }
Prezime = document.Kontakt.Prezime.value;
  if ((Prezime=="")){
  alert("Please, write your Surname");
  document.Kontakt.Prezime.focus();
  return false;
 }
Grad = document.Kontakt.Grad.value;
  if ((Grad=="")){
  alert("Please, write your City and Country");
  document.Kontakt.Grad.focus();
  return false;
 }
Djelatnost = document.Kontakt.Djelatnost.value;
  if ((Djelatnost=="")){
  alert("Please, write your field of work");
  document.Kontakt.Djelatnost.focus();
  return false;
 }
Novine = document.Kontakt.Novine.value;
  if ((Novine=="")){
  alert("Please, write the name of the media service you are representing");
  document.Kontakt.Novine.focus();
  return false;
 }
Tel = document.Kontakt.Tel.value;
  if ((Tel=="")){
  alert("Please, write your telefon/fax");
  document.Kontakt.Tel.focus();
  return false;
 }
Email = document.Kontakt.Email.value;
  if ((Email=="")){
  alert("Please, write your E-mail address");
  document.Kontakt.Email.focus();
  return false;
 }
 document.Kontakt.submit();
}