function appearance(a, s)
		{
			var e=document.getElementById(a);
				e.className='subsection_orange';
			var r=document.getElementById(s);
				r.className='sub_orange';
				
		}
	function disappearance(a, s)
		{
			var e=document.getElementById(a);
				e.className='subsection';
			var r=document.getElementById(s);
				r.className='sub_grey';

		}
		
			function avt(u)
		{
			var o=document.getElementById(u);
				o.style.display="block";
		}
		function noavt(y)
		{
			var p=document.getElementById(y);
				p.style.display="none";
		}