function toggle(a, b) {
	if (!document.getElementById) return true;
	if (b==1) for (var i=majors.length-1; i>=0; i--) if (majors[i] != a) document.getElementById(majors[i]).style.display='none';
	a=document.getElementById(a);
	a.style.display=(a.style.display=='block')?'none':'block';
	return false;
}
function toggleSubMenu(a, b) {
 if (!document.getElementById) return true;
 a=document.getElementById(a);
 a.style.display=(a.style.display=='block')?'none':'block';
 return false;
}