var browser = navigator.appName
var ver = navigator.appVersion
var thestart = parseFloat(ver.indexOf('MSIE'))+1
var brow_ver = parseFloat(ver.substring(thestart+4,thestart+7))

function isIE6() {
	if ((browser=='Microsoft Internet Explorer') && (brow_ver <= 6)) return true;
	else return false;
}

function showMenu(bool,what) {
  if (isIE6()) {
		if (bool) document.getElementById(what).style.display = "block";
		else document.getElementById(what).style.display = "none";
	}
}