$('.p_sub_menu').click(function(){
    $('.p_sub_menu').removeClass('oncolor');
    $(this).addClass('oncolor');
  });

$('#walkingRail').click(function(){
    document.getElementById("change_img").src = "/bizdemo57105/img/pro_img/pro_main_5_1.jpg";
    document.getElementById("change_img0").src = "/bizdemo57105/img/pro_img/walkingrail.jpg";
});

$('#walkingSling').click(function(){
    document.getElementById("change_img").src = "/bizdemo57105/img/pro_img/pro_main_5_2.jpg";
    document.getElementById("change_img0").src = "/bizdemo57105/img/pro_img/walkingsling.jpg";
});

$('#walkingStand').click(function(){
    document.getElementById("change_img").src = "/bizdemo57105/img/pro_img/pro_main_5_3.jpg";
    document.getElementById("change_img0").src = "/bizdemo57105/img/pro_img/walkingstand.jpg";
});