function showPage(snew,sold) {
 var ne = document.getElementById(snew);
 var ol = document.getElementById(sold);
 var tne = 't' + snew;
 var tol = 't' + sold;
  ne.style.display = 'block';
  ol.style.display = 'none';
  document.getElementById(tne).className='chisel_u tab active';
  document.getElementById(tol).className='chisel_u tab inactive';
}