<script type="text/javascript" src="//code.jquery.com/jquery-latest.min.js"></script>
<script type="text/javascript" src="multiPicker/dist/multipicker.min.js"></script>
<link rel="stylesheet" href="multiPicker/dist/multipicker.min.css">

<ul id="days">
    <li>Su</li>
    <li>Mo</li>
    <li>Tu</li>
    <li>We</li>
    <li>Th</li>
    <li>Fr</li>
    <li>Sa</li>
</ul>

$("#days").multiPicker({ selector : "li" });