function showThumb(picfield, imgfield) {
  if ((picfield.value.toLowerCase().indexOf(".jpg") < 0) && (picfield.value.toLowerCase().indexOf(".jpeg") < 0)) {
    alert("Pilt peab olema JPG formaadis!");
    picfield.focus();
  }
  else {
    imgfield.src = picfield.value;
  }
}

var win;

function showPic(file, width, height) {
  if (win)
    win.close();

  win = window.open(file, 'Image', 'location=no,status=no,resizable=no,toolbar=no,scrollbars=no,menubar=no,height='+height+',width='+width+',left=10,top=10');
  win.focus();
}