Select2 Demo

HTML

<script src="http://ivaynberg.github.com/select2/select2-master/select2.js"></script>
<link rel="stylesheet" href="http://ivaynberg.github.com/select2/select2-master/select2.css">
<select id="source" style="width:300px">
            <optgroup label="Alaskan/Hawaiian Time Zone">
                <option value="AK">Alaska</option>
                <option value="HI">Hawaii</option>
            </optgroup>
            <optgroup label="Pacific Time Zone">
                <option value="CA">California</option>
                <option value="NV">Nevada</option>
                <option value="OR">Oregon</option>
                <option value="WA">Washington</option>
            </optgroup>
            <optgroup label="Mountain Time Zone">
                <option value="AZ">Arizona</option>
                <option value="CO">Colorado</option>
                <option value="ID">Idaho</option>
                <option value="MT">Montana</option><option value="NE">Nebraska</option>
                <option value="NM">New Mexico</option>
                <option value="ND">North Dakota</option>
                <option value="UT">Utah</option>
                <option value="WY">Wyoming</option>
            </optgroup>
            <optgroup label="Central Time Zone">
                <option value="AL">Alabama</option>
                <option value="AR">Arkansas</option>
                <option value="IL">Illinois</option>
                <option value="IA">Iowa</option>
                <option value="KS">Kansas</option>
                <option value="KY">Kentucky</option>
                <option value="LA">Louisiana</option>
                <option value="MN">Minnesota</option>
                <option value="MS">Mississippi</option>
                <option value="MO">Missouri</option>
                <option value="OK">Oklahoma</option>
                <option value="SD">South Dakota</option>
                <option value="TX">Texas</option>
                <option...

JavaScript

$('#source').select2();