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

$('#newtonbox_b').click(function(){
    document.getElementById("change_img0").src = "/bizdemo57105/img/pro_img/newtonbox.jpg";
    document.getElementById("change_img").src = "/bizdemo57105/img/pro_img/pro_main_18_1_1.jpg";
});

$('#newtonbox_s').click(function(){
    document.getElementById("change_img0").src = "/bizdemo57105/img/pro_img/newtonbox_s.jpg";
    document.getElementById("change_img").src = "/bizdemo57105/img/pro_img/pro_main_18_2.jpg";
});

$('#newtonbox_m').click(function(){
    document.getElementById("change_img0").src = "/bizdemo57105/img/pro_img/newtonbox_m.jpg";
    document.getElementById("change_img").src = "/bizdemo57105/img/pro_img/pro_main_18_3.jpg";
});