这是一个CSS+层+js的翻页特效,由于本人对js不太懂，希望高手帮忙修改,
将层居中，也就是跟网站logo一样，相对页面居中，层宽750px。不知道能否实现？
<html>
<title></title>
<body>
<style type="text/css">
<!--
.page{
position:absolute;
width:750px;
border:1px solid #999;
background-color:#FFF;
left:425px;
margin-left:-350px;
cursor:default;
z-index:0;
}
ul{
height:320px;
list-style:none;
margin:40px 50px 0px;
padding:0px;
}
.tip{
display:block;
width:100%;
font-size:12px;
color:#999;
text-align:center;
margin:10px 0px 20px;
}
-->
</style>
<body onselectstart="return false;">
<script language="javascript">
function id(obj){
return document.getElementById(obj);
}
var page;
var pp
var lm,mx;
var md=false;
var sh=0;
var en=false;
window.onload=function(){
pp=document.getElementsByTagName("div")
for(var i=0;i<pp.length;i++){
if(pp[i].className=="fy"){
page=pp[i].getElementsByTagName("div");
}
}
//page=document.getElementsByTagName("table").item(0).getElementsByTagName("div");
if(page.length>0){
page[0].style.zIndex=2;
}
for(i=0;i<page.length;i++){
page[i].className="page";
page[i].innerHTML+="<span class=tip>第 "+(i+1)+"/"+page.length+" 页 提示：左右拖拽翻页</span>";
page[i].id="page"+i;
page[i].i=i;
page[i].onmousedown=function(e){
if(!en){
if(!e){e=e||window.event;}
lm=this.offsetLeft;
mx=(e.pageX)?e.pageX:e.x;
this.style.cursor="w-resize";
md=true;
if(document.all){
this.setCapture();
}else{
window.captureEvents(Event.MOUSEMOVE|Event.MOUSEUP);
}
}
}
page[i].onmousemove=function(e){
if(md){
en=true;
if(!e){e=e||window.event;}
var ex=(e.pageX)?e.pageX:e.x;
this.style.left=ex-(mx-lm)+350;
if(this.offsetLeft<75){
var cu=(this.i==0)?page.length-1:this.i-1;
page[sh].style.zIndex=0;
page[cu].style.zIndex=1;
this.style.zIndex=2;
sh=cu;
}
if(this.offsetLeft>75){
var cu=(this.i==page.length-1)?0:this.i+1;
page[sh].style.zIndex=0;
page[cu].style.zIndex=1;
this.style.zIndex=2;
sh=cu;
}
}
}
page[i].onmouseup=function(){
this.style.cursor="default";
md=false;
if(document.all){
this.releaseCapture();
}else{
window.releaseEvents(Event.MOUSEMOVE|Event.MOUSEUP);
}
flyout(this);
}
}
}
function flyout(obj){
if(obj.offsetLeft<75){
if( (obj.offsetLeft + 350 - 20) > -275 ){
obj.style.left=obj.offsetLeft + 350 - 20;
window.setTimeout("flyout(id('"+obj.id+"'));",0);
}else{
obj.style.left=-275;
obj.style.zIndex=0;
flyin(id(obj.id));
}
}
if(obj.offsetLeft>75){
if( (obj.offsetLeft + 350 + 20) < 1125 ){
obj.style.left=obj.offsetLeft + 350 + 20;
window.setTimeout("flyout(id('"+obj.id+"'));",0);
}else{
obj.style.left=1125;
obj.style.zIndex=0;
flyin(id(obj.id));
}
}
}
function flyin(obj){
if(obj.offsetLeft<75){
if( (obj.offsetLeft + 350 + 20) < 425 ){
obj.style.left=obj.offsetLeft + 350 + 20;
window.setTimeout("flyin(id('"+obj.id+"'));",0);
}else{
obj.style.left=425;
en=false;
}
}
if(obj.offsetLeft>75){
if( (obj.offsetLeft + 350 - 20) > 425 ){
obj.style.left=obj.offsetLeft + 350 - 20;
window.setTimeout("flyin(id('"+obj.id+"'));",0);
}else{
obj.style.left=425;
en=false;
}
}
}
</script>
<div class="fy">
<div>
<ul>
这是第一页内容
</ul>
</div>
<div>
<ul>
这是第二页内容
</ul>
</div>
<div>
<ul>
这是第三页内容
</ul>
</div>
<div>
<ul>
这是第四页内容
</ul>
</div>
</div>
</body>
</html>