function show(id)
{
	var el
	if(el = document.getElementById(id))
	{
		el.className = (el.className == 'class2')?'class1':'class2';
	}
}

function linkator(id)
{
	if (el2 = document.getElementById(id))
		return false;
	else
		return true;
}
function getActiveLI () {
	if(document.getElementById("active")) {
		curentUL = document.getElementById("active").parentNode;
		if(curentUL.id != 'Three_level_menu') {
			curentUL.className = "show";
		}
		curentUL = curentUL.parentNode.parentNode;
		if(curentUL.id != 'Three_level_menu') {
			curentUL.className = "show";
		}
	}
}