function search(vehicles) {
  switch(vehicles) {
    case "automobili":
      document.automobili.submit();
    break;
    case "motocikli":
      document.motocikli.submit();
    break;
    case "kamioni":
      document.kamioni.submit();
    break;
    case "priv_masine":
      document.priv_masine.submit();
    break;
    case "nautika":
      document.nautika.submit();
    break;
    case "autobusi":
      document.autobusi.submit();
    break;
    case "delovi":
      document.delovi.submit();
    break;
  }
}