jQuery实现图片局部放大镜效果

下图只是给大家举个例子，类似于这种效果图：

具体实现过程请看下文代码：

css

.zoomPad{
position:relative;
float:left;
z-index:99;
cursor:crosshair;
}
.zoomPreload{
-moz-opacity:0.8;
opacity: 0.8;
filter: alpha(opacity = 80);
color: #333;
font-size: 12px;
font-family: Tahoma;
text-decoration: none;
border: 1px solid #CCC;
padding: 8px;
text-align:center;
background-image: url(../images/zoomloader.gif);
background-repeat: no-repeat;
background-position: 43px 30px;
z-index:110;
width:90px;
height:43px;
position:absolute;
top:0px;
left:0px;
* width:100px;
* height:49px;
}
.zoomPup{
overflow:hidden;
-moz-opacity:0.6;
opacity: 0.6;
filter: alpha(opacity = 60);
z-index:120;
position:absolute;
border:1px solid #CCC;
z-index:101;
cursor:crosshair;
}
.zoomOverlay{
position:absolute;
left:0px;
top:0px;
/*opacity:0.5;*/
z-index:5000;
width:100%;
height:100%;
display:none;
z-index:101;
}
.zoomWindow{
position:absolute;
left:110%;
top:40px;
z-index:6000;
height:auto;
z-index:10000;
z-index:110;
}
.zoomWrapper{
position:relative;
border:1px solid #999;
z-index:110;
}
.zoomWrapperTitle{
display:block;
background:#999;
color:#FFF;
height:18px;
line-height:18px;
width:100%;
overflow:hidden;
text-align:center;
font-size:10px;
position:absolute;
top:0px;
left:0px;
z-index:120;
-moz-opacity:0.6;
opacity: 0.6;
filter: alpha(opacity = 60);
}
.zoomWrapperImage{
display:block;
position:relative;
overflow:hidden;
z-index:110;
}
.zoomWrapperImage img{
border:0px;
display:block;
position:absolute;
z-index:101;
}
.zoomIframe{
z-index: -1;
filter:alpha(opacity=0);
-moz-opacity: 0.80;
opacity: 0.80;
position:absolute;
display:block;
}
/*********************************************************
/ When clicking on thumbs jqzoom will add the class
/ “zoomThumbActive” on the anchor selected
/*********************************************************/

js

/*!
* jQzoom Evolution Library v2.3 – Javascript Image magnifier
* http://www.mind-projects.it
*
* Copyright 2011, Engineer Marco Renzi
* Licensed under the BSD license.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the organization nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* Date: 03 May 2011 22:16:00
*/
(function ($) {
//GLOBAL VARIABLES
var isIE6 = ($.browser.msie