var idTimer = 0; 

function setMenu(menu) {
	clearMenu();
	if (idTimer != 0) {
		clearTimeout(idTimer);
		idTimer = 0;
	}
	showMenu(menu);
	idTimer = setTimeout("clearMenu()",3000);
}


function clearMenu(){
      var submenu = document.getElementById("submenu");
      arrelem = submenu.getElementsByTagName("div");

      for (vari=0;vari<arrelem.length;vari++){
        document.getElementById(arrelem[vari].id).style.display = 'none';
      }
}


function showMenu(menu) {
	document.getElementById(menu).style.display = "block";
}