function showLayer(ind) {
    if (navigator.appName=="Netscape")  
      document.getElementById([ind]).style.visibility='visible';
    else if(navigator.appName=="Microsoft Internet Explorer")  
      document.all[ind].style.visibility = "visible";
  }
  function hideLayer(ind) {
    if (navigator.appName=="Netscape")
      document.getElementById([ind]).style.visibility='hidden';
    else if (navigator.appName=="Microsoft Internet Explorer")
      document.all[ind].style.visibility = "hidden";
  }