var id_menu = new Array('sub_menu_1','sub_menu_2');
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";
}
}