function switch_menu(i)
{
  switch(i)
  {
   case 1:
          $("#menu_about_us").attr("src","/images/nav_btns/new_menu_aboutus_on.jpg");
          break;
    case 2:
          $("#menu_videos").attr("src","/images/nav_btns/new_menu_videos_on.jpg"); 
                        break;  
     case 3:
         $("#menu_services").attr("src","/images/nav_btns/new_menu_services_on.jpg"); 
                        break;  
    case 4:
         $("#menu_photos").attr("src","/images/nav_btns/new_menu_photos_on.jpg");  
                        break;  
    case 5:
         $("#menu_online_store").attr("src","/images/nav_btns/new_menu_onlinestore_on.jpg");  
                        break;
    case 6:
          $("#menu_contact_us").attr("src","/images/nav_btns/new_menu_contactus_on.jpg");  
                        break;
  } 
}