function tikrina(id, report)
{ 
  element = document.getElementById(id);
  if(element.value.length == 0)
  {
    alert(report);
    return false;
  }
  else
  {
    return true;
  }
}

function pop(adresas, id, w, h)
{
  url = adresas + "nuotrauka.php?id=" + id;
  h = h + 20;
  window.open(url, 'pop', 'width='+w+',height='+h+',top='+(screen.height-h)/2+',left='+(screen.width-w)/2+',toolbar=no,location=no,directories=no,menuBar=no,scrollbars=no,resizable=no');
}