function changeContaktPerson(check){
  var ContPerson = document.getElementById("kontakt_pers_");
  var ContTel = document.getElementById('kontakt_tel_');
      
  if(check.checked){
    ContPerson.enabled = true;
    ContTel.enabled = true;
  }else{
    ContPerson.disabled = true;
    ContTel.disabled = true;
  }
   
}