dropdown to resize image

HTML

<script src="https://code.jquery.com/ui/1.11.4/jquery-ui.js"></script>
<link rel="stylesheet" href="https://code.jquery.com/ui/1.11.4/themes/smoothness/jquery-ui.css">
<form action="#">
    <div id="newsDiv">
        <img src="https://hollywoodhatesme.files.wordpress.com/2013/04/roborovski-hamster.jpg" alt="news photo" width="150" height="450">
    </div>
    <fieldset>
        <select name="size" id="size">
            <option value="150">150px</option>
            <option value="200">200px</option>
            <option value="250" selected="selected">250px</option>
            <option value="300">300px</option>
            <option value="350">350px</option>
        </select>
    </fieldset>
</form>

JavaScript

$(document).ready(function () {
    var newsDiv = $("#newsDiv img");

    $("#size").selectmenu({
        select: function (event, data) {
            console.log(data)
            newsDiv.css({
                width: data.item.value,
                height: 600
            });
        }
    });
});