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\">');
}