jquery change picture source

                                    $("#my_image").attr("src","second.jpg");

                                    $("#my_image").attr("src","second.jpg");

                                    $(document).ready(function () {
    $('img').click(function(){
        $(this).attr('src','images/download.jpeg')
      })
})

                                    // https://codepen.io/kman/pen/dXjpoX
// Stockphotos JS

$(document).ready(function(){
  var flag = 0;  
  $("button#changeSize").click(function(){
    if(flag == 0) {
      $("#dummyimage").attr("src","http://dummyimage.com/350x155/");
      flag = 1;
    }
    else if(flag == 1) {
      $("#dummyimage").attr("src","http://dummyimage.com/450x255/");
      flag = 0;
    }
  });
});