jQuery Increase Decrease Font Size of Website Dynamically.

<script type="text/javascript">

        $(document).ready(function() {

            var divtxt = $('#fontdiv');

            // Increase Font Size

            $('#btnincfont').click(function() {

                var curSize = divtxt.css('fontSize');

                var newSize = parseInt(curSize.replace("px", "")) + 1;

                $(divtxt).css("fontSize", newSize + "px");

            });

            // Decrease Font Size

            $('#btndecfont').click(function() {

                var curSize = divtxt.css('fontSize');

                var newSize = parseInt(curSize.replace("px", "")) - 1;

                $(divtxt).css("fontSize", newSize + "px");

            })

        });

    </script>

<div id="fontdiv">

           . . .

           . . .

           . . .

</div>

<br />

<input type="button" id="btnincfont" value=" + " />

<input type="button" id="btndecfont" value=" - " />