function meta() {
  var n = (document.layers) ? 1:0;
  var ie = (document.all) ? 1:0;

//  if (n) document.write('');
 // if (ie) 
  document.write('<meta http-equiv="Pragma" content="no-cache"><meta http-equiv="Cache-Control" content="no-cache"><meta http-equiv="expires" content="0">');
}