var isNS = (navigator.appName == "Netscape");
var is_major = parseInt(navigator.appVersion);
var is_minor = parseFloat(navigator.appVersion);
var is_nav405 = (isNS && (is_major == 4) && (is_minor < 4.06));
var isMacIE = ((navigator.userAgent.indexOf("IE 4") > -1) &&
   (navigator.userAgent.indexOf("Mac") > -1));
var isDynamic = ((document.layers || document.all || document.getElementById) &&
   !isMacIE && !is_nav405);

if (isDynamic) {
   document.write("<style type='text/css'>");
   document.write(".sidemenu {display: none}");
   document.write("</style>");

   var max = 8;
   var menuVisible = new Array();
   for (var i=1;i<=max;i++) {
      menuVisible[i+1] = false;
   }
}

function activateMenu(i) {
   if (!isDynamic) {
      alert('This website requires Internet Explorer or Netscape versions 5 and higher.');
      return;
   }

   menuVisible[i] = (menuVisible[i]) ? false : true;
   current = (menuVisible[i]) ? 'block' : 'none';

   if (isNS) {
      document.getElementById('menu'+i).style.display = current;
   }
   else {
      document.all['menu'+i].style.display = current;
   }
}