function onReady() {
    $(`p>img`)
    .after(appendExpandButton)
    .next()
    .on('click', onExpandButton);

    $(`#expand-img button`).on(`click`, onHideImgExpand);
}

function appendExpandButton(img) {
    return `<btn class='btn btn-primary' data-img="${this.src}">+<btn>`
}

function onExpandButton(e) {
    var imgSrc = this.getAttribute(`data-img`);
    $(`#expand-img img`).attr(`src`, imgSrc);
    $(`#expand-img`).show(0);
}

function onHideImgExpand() {
    $(`#expand-img`).hide(500);
}

(function() {
    $(document).ready(onReady)
})()