function showSubMenu(id){

    if(id == visibleSubMenu){
        return;
    }

    if(visibleSubMenu != 0){
        $('menu'+visibleSubMenu).className = '';
        $('menu'+id).className = 'selected';
        Effect.DropOut('subMenu'+visibleSubMenu);
    }else{
        $('menu'+id).className = 'selected';
        Effect.DropOut('subMenu'+visibleSubMenu);
    }
 
    Effect.Appear("subMenu"+id);
    visibleSubMenu = id;
}

if(typeof(visibleSubMenu) == "undefined"){
    visibleSubMenu = "0";
    Effect.Appear('subMenu'+visibleSubMenu);
}else{
    Effect.Appear('subMenu'+visibleSubMenu);
    $('menu'+visibleSubMenu).className = 'selected';
}