How to enlarge image using jquery

They do not increase, what actually happens is that when you click on the “Zoom” text, the image inside the div is replaced with a larger version of this image. And the overflow is set to hidden.

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
    <title>Example</title>

    <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js"></script>
    <script type="text/javascript">
        $(function() {
                var fullWidth = 864; // Width in pixels of full-sized image
                var fullHeight = 648; // Height in pixels of full-sized image
                var thumbnailWidth = 389;  // Width in pixels of thumbnail image
                var thumbnailHeight = 292;  // Height in pixels of thumbnail image

                // Set size of div
                $('#picture').css({
                        'width': thumbnailWidth+'px',
                        'height': thumbnailHeight+'px'
                });

                // Hide the full-sized picture
                $('#full').hide();

                // Toggle pictures on click
                $('#picture').click(function() {
                        $('#thumbnail').toggle();
                        $('#full').toggle();
                });

                // Do some calculations
                $('#picture').mousemove(function(e) {
                        var mouseX = e.pageX - $(this).attr('offsetLeft'); 
                        var mouseY = e.pageY - $(this).attr('offsetTop'); 

                        var posX = (Math.round((mouseX/thumbnailWidth)*100)/100) * (fullWidth-thumbnailWidth);
                        var posY = (Math.round((mouseY/thumbnailHeight)*100)/100) * (fullHeight-thumbnailHeight);

                        $('#full').css({
                                'left': '-' + posX + 'px',
                                'top': '-' + posY + 'px'
                        });
                });
        });
    </script>

    <style type="text/css">
        #picture {
                overflow: hidden;
                position: relative;
                border: 1px solid #000000;
        }

        #thumbnail {
                cursor: pointer;
        }

        #full {
                position: relative;
                cursor: crosshair;
        }
    </style>
</head>

<body>
    <div id="picture">
        <img alt="" id="thumbnail" src="http://img202.imageshack.us/img202/8403/93629325.jpg" />
        <img alt="" id="full" src="http://img111.imageshack.us/img111/4734/tbmecsekyellowflower.jpg" />
    </div>
</body>
</html>

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How to enlarge image using jquery

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