function clear()
{
	document.getElementById("home").className = "menu";
	document.getElementById("firma").className = "menu";
	document.getElementById("news").className = "menu";
	document.getElementById("anfahrt").className = "menu";
	document.getElementById("kontakt").className = "menu";
	document.getElementById("impressum").className = "menu";
}

function activate(id)
{
	clear();
	document.getElementById(id).className = "menuaktiv";
}