Changing the image source using jQuery

Answer 1

Hope this can work

Change Size

$(document).ready(function() {
    var flag = 0;
    $("button#changeSize").click(function() {
        if (flag == 0) {
            $("#dummyimage").attr("src", "http://dummyimage.com/250x155/");
            flag = 1;
        } else if (flag == 1) {
            $("#dummyimage").attr("src", "http://dummyimage.com/450x255/");
            flag = 0;
        }
    });
});