function menuActivate(a,b){
	var td = document.getElementById(a);
	var elem = document.getElementById(b);
	td.className = 'td_active';
	elem.className = 'menu_active';
}

function menuDeactivate(a,b,c,d){
	var td = document.getElementById(a);
	var elem = document.getElementById(b);
	td.className = d;
	elem.className = c;
}