function seaon() {
  document.getElementById("search_full").setAttribute('style','display: inline');
  document.getElementById("sea_on_butt").setAttribute('style','display: none');
  document.getElementById("sea_off_butt").setAttribute('style','display: table-row');
  //document.getElementById("search_fast").setAttribute('style','display: none');
};

function seaoff() {
  document.getElementById("search_full").setAttribute('style','display: none');
  document.getElementById("sea_off_butt").setAttribute('style','display: none');
  document.getElementById("sea_on_butt").setAttribute('style','display: table-row');
  //document.getElementById("search_fast").setAttribute('style','display: inline');
};

function val(form) {
  if (form.fulltxt.value.length < 3) {
     alert("Musíte zadat alespoň 3 znaky!\nYou must enter minimum 3 characters!");
     form.fulltxt.focus();
     return false;
  } else {
   return true;
  }
};