function TreeSwitch (el)	{
	if (eval (el).style.display == 'block')		{
		 eval (el).style.display = 'none';
		 eval (el + "_but").className = "more_close"
		}
		else	{
			eval (el).style.display = 'block'; 
			eval (el + "_but").className = "more_open"
			}
	}