Increase decrease font size using jquery

<html>
<head>
    <style>
        .divClass {
            font-size: 16px;
            background-color: #E3E3E3;
            width: 500px;
            padding: 5px;
        }
    </style>
    <script src="jquery-1.11.2.js"></script>
    <script type="text/javascript">
        $(document).ready(function () {
            $('#linkIncrease').click(function () {
                modifyFontSize('increase');
            });

            $('#linkDecrease').click(function () {
                modifyFontSize('decrease');
            });

            $('#linkReset').click(function () {
                modifyFontSize('reset');
            })

            function modifyFontSize(flag) {
                var divElement = $('#divContent');
                var currentFontSize = parseInt(divElement.css('font-size'));

                if (flag == 'increase')
                    currentFontSize += 3;
                else if (flag == 'decrease')
                    currentFontSize -= 3;
                else
                    currentFontSize = 16;

                divElement.css('font-size', currentFontSize);
            }
        });
    </script>
</head>
<body style="font-family:Arial">
    Font-Size:
    <a id="linkIncrease" href="#">Increase</a>
    <a id="linkDecrease" href="#">Decrease</a>
    <a id="linkReset" href="#">Reset</a>
    <br /><br />
    <div id="divContent" class="divClass">
        <b>jQuery Tutorial</b>
        <ul>
            <li>What is jQuery</li>
            <li>What is $(document).ready(function() in jquery</li>
            <li>Benefits of using CDN</li>
            <li>#id selector</li>
            <li>Element Selector</li>
            <li>class selector</li>
            <li>attribute selector</li>
            <li>attribute value selectors</li>
            <li>case insensitive attribute selector</li>
            <li>jQuery input vs :input</li>
        </ul>
    </div>
</body>
</html>

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