function menuchange(subId, mainId){
		document.getElementById("m1").parentNode.className = "";
		document.getElementById("m2").parentNode.className = "";
		document.getElementById("m3").parentNode.className = "";
		document.getElementById("m4").parentNode.className = "";
		document.getElementById("m6").parentNode.className = "";

		document.getElementById( mainId ).parentNode.className = "act";
		
		document.getElementById("menuline1").style.display = "none";
		document.getElementById("menuline2").style.display = "none";
		document.getElementById("menuline3").style.display = "none";
		document.getElementById("menuline4").style.display = "none";
		document.getElementById("menuline6").style.display = "none";
		
  		document.getElementById(subId).style.display = "block";
		
}