Dowemo
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1. Js code.
<script type="text/javascript">
 jQuery(document).ready(function($) {
 $(".index_nav li a").click(function(event) { 
 var index=this.title
 var id='#'+'index_'+index
 $("html,body").animate({scrollTop: $(id).offset().top}, 1000);
 });
 $(".taoba").click(function(event) { 
 var index=this.title
 var id='#'+'index_'+index
 $("html,body").animate({scrollTop: $(id).offset().top}, 1000);
 });
 function a(x,y){
 l = $('#main').offset().left;
 w = $('#main').width();
 $('#tbox').css('left',(l + w + x) + 'px');
 $('#tbox').css('bottom',y + 'px');
 }//获取#tbox的div距浏览器底部和页面内容区域右侧的距离函数#main为页面的可视宽度
 $(function() { 
 $(window).scroll(function(){
 t = $(document).scrollTop();
 if(t>500){
 $('#tbox').show();
 }else{
 $('#tbox').hide();
 }
 if(t> 50){
 $('#gotop').fadeIn('slow');
 }else{
 $('#gotop').fadeOut('slow');
 } 
 }) 
 a(10,100);//#tbox的div距浏览器底部和页面内容区域右侧的距离
 $('#gotop').click(function(){ 
 $('body,html').animate({
 scrollTop: 0
 },
 800);//点击回到顶部按钮,缓懂回到顶部,数字越小越快
 return false; 
 })
 });
 });
</script>

2. Html code.

<body>
<div class="indexnav_wrap">
 <ul class="index_nav">
 <li><a href="javascript:void(0)" title="1"><i>活动</i><strong>1</strong></a></li>
 <li><a href="javascript:void(0)" title="2"><i>活动</i><strong>2</strong></a></li>
 <li><a href="javascript:void(0)" title="3"><i>活动</i><strong>3</strong></a></li>
 <li><a href="javascript:void(0)" title="4"><i>活动</i><strong>4</strong></a></li>
 <li><a href="javascript:void(0)" title="5"><i>活动</i><strong>5</strong></a></li>
 </ul>
</div>
<div class="h50"></div>
<div class="row" id="main">
 <h2 id="index_1">这是第一个活动页</h2>
 <div class="mainpage mainpage1">
 </div>
</div>
<div class="h15"></div>
<div class="row">
 <h2 id="index_2">这是第二个活动页</h2>
 <div class="mainpage mainpage2">
 </div>
</div>
<div class="h15"></div>
<div class="row">
 <h2 id="index_3">这是第三个活动页</h2>
 <div class="mainpage mainpage3">
 </div>
</div>
<div class="h15"></div>
<div class="row">
 <h2 id="index_4">这是第四个活动页</h2>
 <div class="mainpage mainpage4">
 </div>
</div>
<div class="h15"></div>
<div class="row">
 <h2 id="index_5">这是第五个活动页</h2>
 <div class="mainpage mainpage5">
 </div>
</div>
<div id="tbox"><!-- 这个必须有 id="tbox"-->
 <a class="taoba" href="javascript:void(0)" title="1">1</a>
 <a class="taoba" href="javascript:void(0)" title="2">2</a>
 <a class="taoba" href="javascript:void(0)" title="3">3</a>
 <a class="taoba" href="javascript:void(0)" title="4">4</a>
 <a class="taoba" href="javascript:void(0)" title="5">5</a>
 <a id="gotop" href="javascript:void(0)" title="回到顶部">回到顶部</a> <!-- 这个也是id="gotop" -->
</div>
</div>
</body>
3. Css part.
@charset"utf-8";
/* CSS Document Download by http://www.codefans.net*/
.gray {
 -webkit-filter: grayscale(100%);
 -moz-filter: grayscale(100%);
 -ms-filter: grayscale(100%);
 -o-filter: grayscale(100%);
 filter: grayscale(100%);
 filter: gray;
}
/* reset */
body, div, dl, dt, dd, ul, ol, li, h1, h2, h3, h4, h5, h6, p, form, fieldset, legend, input, button, textarea, th, td {
 margin:0;
 padding:0; 
}
table {
 border-collapse:collapse;
 border-spacing:0;
}
fieldset, img {
 border:0;
}
ul,li {
 list-style:none;
}
body {
 background: #f1f1f1;
 color: #666;
 font:12px/1.7 Helvetica,Arial,Tahoma,sans-serif,"5B8B4F53";
}
.row:after {
 clear:both;
 content:'020';
 display:block;
 height:0; 
}
.row {
 zoom:1;
}
/*链接颜色*/
a,button{outline:none;/*移除虚线框 IE8,FF有用*/hide-focus: expression(this.hideFocus=true);/*IE6、IE7*/}
a{
 color:#999;
 text-decoration:none;
}
a:hover{
 color:#be0000;
 text-decoration: underline;
}
.fst{
 font-family:"5B8B4F53";
}
h1,h2,h3,h4,h5,h6{font-family:5FAE8F6F96C59ED1; font-size: 16px;}
/* end reset */
.row{
 width:1000px;
 margin:0 auto;
}
/*模板头部,所有专题页面公用*/
.index_nav{width:575px; height: 70px; margin: 0 auto; padding-left: 5px; background: #fff;}
.index_nav li{width: 115px; height: 70px; float: left;}
.index_nav li a{display: block; float: left; width: 70px;height: 70px; background:url(../images/index_nav.gif) 0 0 no-repeat; text-align: center; color: #e02800;}
.index_nav li a i{display: block; padding-top: 12px; height: 22px; line-height: 22px;}
.index_nav li a strong{font-family: Arial, Helvetica, sans-serif; font-weight: bold; font-size: 24px; display: block; height: 30px; line-height: 20px;}
.index_nav li a:hover{background-position: 0 -70px; color: #fff; text-decoration: none;}
.h15{height: 15px; overflow: hidden;}
.mainpage{width: 1000px; height:1000px;}
h2{font-size: 24px; text-align: center; color: #333; font-weight: bold;}
.mainpage p{width: 650px; margin: 0 auto; color: #fff; font-size: 16px; padding: 50px 0 50px;}
.mainpage1{background: #fe6400;}
.mainpage2{background: #be0000;}
.mainpage3{background: #ccc;}
.mainpage4{background: #0093dd;}
.mainpage5{background: #a8cf33;}
*html{background-image:url(about:blank);background-attachment:fixed;}/*低版本浏览器防止抖动的,必须有*/
#tbox{width:30px; height:200px; float:right; position:fixed; display: none;
_position:absolute;
_bottom:auto;
_top:expression(eval(document.documentElement.scrollTop+document.documentElement.clientHeight-this.offsetHeight-(parseInt(this.currentStyle.marginTop,10)||0)-(parseInt(this.currentStyle.marginBottom,10)||0)));
_margin-bottom:50px;
}/*这个只能改宽高其他的不要修改,需要滚动的内容都要放在这个div里面*/
.taoba{display:block; background:#c2c2c2; width:30px; height:30px; margin-bottom:4px;text-align: center; color: #fff; line-height: 30px; overflow: hidden;cursor:pointer}
.taoba:hover{background:#ff4200; text-decoration: none; color: #fff;}
#gotop{display:block; width:30px; height:30px; text-indent:-9999px; overflow: hidden; color: #fff; background:url(../images/top_icon.gif) no-repeat; position:absolute; display:none; cursor:pointer}/*这个样式随便改,必须有position:absolute; */
#gotop:hover{background-position: 0 -30px;}
4. Add one.
<script src="js/jquery.min.js" type="text/javascript"></script>





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