//**************************************************************

// jQZoom allows you to realize a small magnifier window,close

// to the image or images on your web page easily.

//

// jqZoom version 2.2

// Author Doc. Ing. Renzi Marco(www.mind-projects.it)

// First Release on Dec 05 2007

// i'm looking for a job,pick me up!!!

// mail: renzi.mrc@gmail.com

//**************************************************************

(function ($) {

    $.fn.jqueryzoom = function (options) {

        var settings = {

            xzoom: 200,        //zoomed width default width

            yzoom: 200,        //zoomed div default width

            offset: 10,        //zoomed div default offset

            position: "right",//zoomed div default position,offset position is to the right of the image

            lens: 1, //zooming lens over the image,by default is 1;

            preload: 1

        };

        if (options)

        {

            $.extend(settings, options);

        }

        var noalt = '';

        $(this).hover(function () {

            var imageLeft = $(this).offset().left;

            var imageTop = $(this).offset().top;

            var imageWidth = $(this).children('img').get(0).offsetWidth;

            var imageHeight = $(this).children('img').get(0).offsetHeight;

            noalt = $(this).children("img").attr("alt");

            var bigimage = $(this).children("img").attr("jqimg");

            $(this).children("img").attr("alt", '');

            if ($("div.zoomdiv").get().length == 0)

            {

                $(this).after("<div class='zoomdiv'><img class='bigimg' src='" + bigimage + "'/></div>");

                $(this).append("<div class='jqZoomPup'>&nbsp;</div>");

            }

            if (settings.position == "right")

            {

                if (imageLeft + imageWidth + settings.offset + settings.xzoom > screen.width)

                {

                    leftpos = imageLeft - settings.offset - settings.xzoom;

                } else

                {

                    leftpos = imageLeft + imageWidth + settings.offset;

                }

            } else

            {

                leftpos = imageLeft - settings.xzoom - settings.offset;

                if (leftpos < 0)

                {

                    leftpos = imageLeft + imageWidth + settings.offset;

                }

            }

            $("div.zoomdiv").css({ top: imageTop, left: leftpos });

            $("div.zoomdiv").width(settings.xzoom);

            $("div.zoomdiv").height(settings.yzoom);

            $("div.zoomdiv").show();

            if (!settings.lens)

            {

                $(this).css('cursor', 'crosshair');

            }

            $(document.body).mousemove(function (e) {

                mouse = new MouseEvent(e);

                /*$("div.jqZoomPup").hide();*/

                var bigwidth = $(".bigimg").get(0).offsetWidth;

                var bigheight = $(".bigimg").get(0).offsetHeight;

                var scaley = 'x';

                var scalex = 'y';

                if (isNaN(scalex) | isNaN(scaley))

                {

                    var scalex = (bigwidth / imageWidth);

                    var scaley = (bigheight / imageHeight);

                    $("div.jqZoomPup").width((settings.xzoom) / scalex);

                    $("div.jqZoomPup").height((settings.yzoom) / scaley);

                    if (settings.lens)

                    {

                        $("div.jqZoomPup").css('visibility', 'visible');

                    }

                }

                xpos = mouse.x - $("div.jqZoomPup").width() / 2 - imageLeft;

                ypos = mouse.y - $("div.jqZoomPup").height() / 2 - imageTop;

                if (settings.lens)

                {

                    xpos = (mouse.x - $("div.jqZoomPup").width() / 2 < imageLeft) ? 0 : (mouse.x + $("div.jqZoomPup").width() / 2 > imageWidth + imageLeft) ? (imageWidth - $("div.jqZoomPup").width() - 2) : xpos;

                    ypos = (mouse.y - $("div.jqZoomPup").height() / 2 < imageTop) ? 0 : (mouse.y + $("div.jqZoomPup").height() / 2 > imageHeight + imageTop) ? (imageHeight - $("div.jqZoomPup").height() - 2) : ypos;

                }

                if (settings.lens)

                {

                    $("div.jqZoomPup").css({ top: ypos, left: xpos });

                }

                scrolly = ypos;

                $("div.zoomdiv").get(0).scrollTop = scrolly * scaley;

                scrollx = xpos;

                $("div.zoomdiv").get(0).scrollLeft = (scrollx) * scalex;

            });

        }, function () {

            $(this).children("img").attr("alt", noalt);

            $(document.body).unbind("mousemove");

            if (settings.lens)

            {

                $("div.jqZoomPup").remove();

            }

            $("div.zoomdiv").remove();

        });

        count = 0;

        if (settings.preload)

        {

            $('body').append("<div style='display:none;' class='jqPreload" + count + "'>sdsdssdsd</div>");

            $(this).each(function () {

                var imagetopreload = $(this).children("img").attr("jqimg");

                var content = jQuery('div.jqPreload' + count + '').html();

                jQuery('div.jqPreload' + count + '').html(content + '<img src=\"' + imagetopreload + '\">');

            });

        }

    }

})(jQuery);

function MouseEvent(e) {

    this.x = e.pageX;

    this.y = e.pageY;

}

/*jQzoom*/

.jqzoom{

    border:1px solid #BBB;

    float:left;

    position:relative;

    padding:0px;

    cursor:pointer;

}

div.zoomdiv {

    z-index:;

    position                : absolute;

    top:0px;

    left:0px;

    width                   : 200px;

    height                  : 200px;

    background: #ffffff;

    border:1px solid #CCCCCC;

    display:none;

    text-align: center;

    overflow: hidden;

}

div.jqZoomPup {

    z-index                 :;

    visibility              : hidden;

    position                : absolute;

    top:0px;

    left:0px;

    width                   : 50px;

    height                  : 50px;

    border: 1px solid #aaa;

    background: #ffffff url(../images/zoomlens.gif) 50% top  no-repeat;

    opacity: 0.5;

    -moz-opacity: 0.5;

    -khtml-opacity: 0.5;

    filter: alpha(Opacity=50);

}

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >

<head>

    <title></title>

    <script src="jquery-1.8.2.min.js" type="text/javascript"></script>

    <script src="jquery.jqzoom.js" type="text/javascript"></script>

    <link href="jqzoom.css" rel="stylesheet" type="text/css" />

    <script type="text/javascript">

        /*使用jqzoom*/

        $(function() {

            $(".jqzoom").jqueryzoom({

                xzoom: 400, //放大图的宽度(默认是 200)

                yzoom: 400, //放大图的高度(默认是 200)

                offset: 10, //离原图的距离(默认是 10)

                position: "right", //放大图的定位(默认是 "right")

                preload: 1

            });

        });

    </script>

</head>

<body>

<div class="jqzoom">

    <img src="data:images/shoe1_small.jpg" style="width:300px; height:300px;" alt=""  jqimg="images/shoe1_big.jpg" id="bigImg"/>

</div>

</body>

</html>