cn = new String();
function ChangeClass2(val,cn){
		if (document.getElementById && document.createElement) {
			document.getElementById('n'+val).className = cn;
  } else {
  }
}

function MenuOn(val)
{
			 ChangeClass2(val,"block");
}

function MenuOff(val)
{
    ChangeClass2(val,"hidden");
}