var id_menu = new Array('sub_menu_1','sub_menu_2','sub_menu_3');function allclose() { for (i=0; i < id_menu.length; i++){  document.getElementById(id_menu[i]).style.display = "none"; }}function openMenu(id){ for (i=0; i < id_menu.length; i++){  if (id != id_menu[i]){   document.getElementById(id_menu[i]).style.display = "none";  } } if (document.getElementById(id).style.display == "block"){  document.getElementById(id).style.display = "none"; }else{  document.getElementById(id).style.display = "block"; }}