var id_menu = new Array('sub_menu_0','sub_menu_1','sub_menu_2', 'sub_menu_3', 'sub_menu_4', 'sub_menu_5', 'sub_menu_6', 'sub_menu_7', 'sub_menu_8', 'sub_menu_9', 'sub_menu_10', 'sub_menu_11', 'sub_menu_12');

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";       

                  
	}
}