function gbWrite() { 
  if (document.getElementById) { // DOM3 = IE5, NS6 
      document.getElementById('gbWrite').style.display = 'block'; 
      document.getElementById('gbWriteLink').style.display = 'none'; 
  }else{ 
      if (document.layers) { // Netscape 4 
          document.gbWrite.display = 'block'; 
          document.gbWriteLink.display = 'none'; 
      }else{ // IE 4 
          document.all.gbWrite.style.display = 'block';
          document.all.gbWriteLink.style.display = 'none'; 
      } 
  } 
}