function popup(id) {
    url='../button/select.php?id=' + id; 
    window.open(url,'mywindow','width=199,height=150,toolbar=no, location=no,directories=no,status=no,menubar=no,scrollbars=no,copyhistory=no,resizable=no');
  }
  
  function updatecolor(id) {
    document.getElementById(id + '_preview').style.background = '#' + document.getElementById(id).value;
  }