不多说了，先给大家展示效果图，本文支持源码下载哦，需要的朋友可以直接下载使用，代码很简单哦～

html代码：

<a href="#">换肤</a>

<div class="heitiao"></div>

<div class="con"><img src="images/content.png" /></div>

<div class="head">

<div class="menu">

<div class="title">

<p class="p1"></p>

<p class="p2"></p>

</div>

<div class="bg">

<div class="bgcon">

<img class="big" src="images/bg0s.jpg">

<img src="images/bg1s.jpg">

<img src="images/bg2s.jpg">

<img src="images/bg3s.jpg">

<img src="images/bg4s.jpg">

<img src="images/bg5s.jpg">

<img class="big" src="images/bg6s.jpg">

<img src="images/bg7s.jpg">

<img src="images/bg8s.jpg">

<img class="last" src="images/bg9s.jpg">

<img class="last" src="images/bg10s.jpg">

<img class="last" src="images/bg11s.jpg">

</div>

<div class="bgyl">

<img src="images/yl.png">

</div>

</div>

</div>

</div>

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

<script type="text/javascript">

var i=1;

$("a").click(function(){

$(".head").animate({height:"288px"},500);

});

$(".p2").click(function(){

$(".head").animate({height:"0px"},500);

});

$(".bgcon img").hover(function(){

i=$(this).index();

$(".bgyl").css("background",'url(images/bg'+i+'.jpg)');

$(".bgyl").css("background-size","264px 180px");

});

$(".bgcon img").click(function(){

$("body").css("background",'url(images/bg'+i+'.jpg)');

});

</script>

css代码：

*{margin:0;padding:0}

a{color:#fff;

margin-top:10px;

display:block;

margin-left:18%;

font-size:13px;

position:absolute;

}

body{background:url(images/bg0.jpg);}

.con{width:911px;

height:317px;

margin:50px auto;}

.head{width:100%;

height:0px;

background:#fff;

position:fixed;

left:0px;

top:0px;

border-bottom:1px solid #e3e3e3;

overflow:hidden;

}

.title{width:911px;

height:45px;

margin:0px auto;}

.heitiao{width:100%;

height:35px;

background:rgba(0,0,0,0.7);

}

.menu{width:100%;

height:45px;

border-bottom:1px solid #e3e3e3;}

.p1{width:861px;

height:45px;

background:url(images/p1.png);

float:left;

cursor:pointer;}

.p2{width:50px;

height:45px;

background:url(images/sp.png);

float:right;

cursor:pointer;

}

.bg{width:911px;

height:205px;

margin:25px auto;}

.bgcon{width:590px;

height:190px;

float:left;

}

.bgcon img{width:97px;

height:59px;

display:block;

float:left;

margin-right:1px;

margin-bottom:1px;

}

.bgcon .big{width:195px;

height:119px;}

.bgcon .last{position:relative;

top:-60px;

}

.bgyl{width:264px;

height:180px;

float:right;

background:url(images/bg1s.jpg);

background-size:294px;}

以上代码就是本文介绍基于jQuery实现仿百度首页换肤背景图片切换代码，希望大家喜欢。