<!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>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<style type="text/css">
* {
margin:0;
padding:0;
font-family:Arial, sans-serif;
font-size:12px;
}
img{
border:0;
}
ul.thumbs {
float:left;
list-style:none;
margin:0;
padding:0;
}
ul.thumbs li {
float:left;
margin:10px 160px;
}
ul.thumbs li a.imgTip{
display:block;
}
#newBigPop {
border:1px solid #999;
position:absolute;
left:0px;
top:0px;
display:none;
}
.loader {
background:#fff url(images/loading.gif) center center no-repeat;
}

#newBigPop .close{
position:absolute;
right:2px;
top:2px;
color:#EF7E2C;
padding:4px;
text-decoration: none;
}
</style>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js" type="text/javascript"></script>
<script type="text/javascript">

/* jQuery图片预加载插件。 */
jQuery.fn.loadthumb = function(options) {
options = $.extend({
src : ""
},options);
var _self = this;
_self.hide();
var img = new Image();
$(img).load(function(){
_self.attr("src", options.src);
_self.fadeIn("slow");
}).attr("src", options.src); //.atte("src",options.src)要放在load后面，
return _self;
}

$(document).ready(function(){
$('.imgTip').each(function(i){
$('.small_' + (i + 1)).bind("mouseenter",function(e){
var top = $(this).offset().top + $(this).height()/2;
var left = $(this).offset().left + $(this).width()/2;
if( $(e.relatedTarget).attr("id")!="newBigPop" && $(e.relatedTarget).attr("id")!="bigimg" ){
$("#newBigPop").css({
position:"absolute",
top:top,
left:left
})
.show();
$('#bigimg').loadthumb({src:"images/big_" + (i + 1) + ".jpg"});
}
return false;
}).bind("mouseleave",function(e){
if( $(e.relatedTarget).attr("id")!="newBigPop" && $(e.relatedTarget).attr("id")!="bigimg" ){
$("#newBigPop").hide();
}
return false;
});
});
$("#newBigPop").bind("mouseleave",function(e){
if( !$(e.relatedTarget).attr("src") && !$(e.relatedTarget).parent().hasClass("imgTip") ){
$(this).hide();
}
return false;
})
$("#newBigPop .close").bind("click",function(){
$("#newBigPop").fadeOut(100);
return false;
})
});

</script>
</head>

<body>


<ul class="thumbs">
<li><a class="small_1 imgTip" href="#"><img src="images/small_1.jpg" /></a></li>
<li><a class="small_2 imgTip" href="#"><img src="images/small_2.jpg" /></a></li>
</ul>



<div id="newBigPop" class="loader">
<img src="images/big_2.jpg" id="bigimg" />
<a href="#" class="close">关闭</a>
</div>

</body>
</html>
图片用的是同一目录下的small和big作为命名前缀。
原文地址:http://www.corange.cn/archives/2010/07/3670.html