Select2 Multiple Value

HTML

<script src="http://ivaynberg.github.io/select2/select2-3.4.3/select2.js"></script>
<link rel="stylesheet" href="http://ivaynberg.github.io/select2/select2-3.4.3/select2.css">
<form name="form1" id="form1" action="" method="GET">
    <fieldset>
        <legend>Shoe Info</legend>
        <dl>	<dt>Name:</dt>

            <dd>
                <input type="text" name="name" id="name" size="40" placeholder="Shoe name" required autofocus>
            </dd>
        </dl>	<dt>Tags:</dt>

        <dd>
            <select multiple="" name="tags[]" id="tags" style="width:100%;">
                <option value="0">Select Tags</option>
                <option value="2">racing flat</option>
                <option value="3">track spikes</option>
                <option value="1">trainer</option>
            </select>
        </dd>
        </dl>
    </fieldset>
    <p class="submit-buttons">
        <input type="submit" class="button1" name="submit" id="submit" value="Add Shoes" />
    </p>
</form>

JavaScript

$(document).ready(function () {
    $("#tags").select2({
        maximumSelectionSize: 3
    });

});