function SpremeniGeslo(){
  if (isset($_POST['mojmojGumb'])){
    echo "<br>";
    $password = strip_tags($_POST['trenutnogeslo']);
    $password1 = strip_tags($_POST['newpassword1']);
    $password2 = strip_tags($_POST['newpassword2']);
    $link=open_database_connection();
    $kodirano_geslo = sha1($password);
    $novo_kodirano_geslo = sha1($password1);
    $abc = $_SESSION['mojamojaSeja'];
    $preverisql = mysqli_query($link,"SELECT username, password FROM registracija WHERE username='$abc' AND password='$kodirano_geslo'");

    if ($password == "" || $password1 == "" || $password2 == ""){
      echo "Niste izpolnili vseh podatkov";
    } else {
      if ($password == $password1){
        echo "Novo geslo ne sme biti enako kot staro geslo";
      } else {
        if ($password1 !== $password2){
          echo "Novi gesli se ne ujemata";
        } else {
          if (mysqli_num_rows($preverisql) == 0){
            echo "Vnesli ste napacno geslo";
        } else {
          if ($password < 8){
            echo "Geslo mora biti vsaj 8 znakov dolgo";
          } else {
          mysqli_query($link,"UPDATE registracija SET password='$novo_kodirano_geslo' WHERE username='$abc'");
          echo "Geslo uspešno spremenjeno";
        }
      }
      }
}
}
}
}