老师，不加cookie的时候程序一切正常，加了cookie和判断条件之后第一次条件正常运行，第二次的时候那个半透明背景就一直去不掉，找不到哪里出了错误，有帮我看下的吗？谢谢
谢谢
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>新手引导页面</title>
<link rel="stylesheet" type="text/css" href="css/style.css">
<style type="text/css">
html,p,div{ margin: 0; padding: 0;}
html{ height: 100%}
body{ height: 100%; background: url(../images/body.png) center top no-repeat;}
#mask{
height: 100%;
width: 100%;
position: absolute;
left: 0;
top: 0;
background-color: #000;
opacity: 0.3;
filter:alpha(opatity=30);}
#seachTip{
width: 980px;
height: 800px;
position: absolute;
left: 50%;
top: 0;
margin-left: -490px;
display: none;
}
#seachTip div{ position: absolute; display: none;}
#seachTip div a{
width: 91px;
height: 30px;
position: absolute;
cursor: pointer;
opacity: 0; }
#seachTip div span{
width: 29px;
height: 29px;
line-height: 29px;
position: absolute;
opacity: 0;
cursor: pointer;}
#seachTip .seachA{
background-image: url(../images/guide11.png);
width: 745px;
height: 329px;
left: -8px;
top: 130px;
}
.seachA a{
left: 493px;
top: 232px;
}
.seachA span{
left: 684px;
top: 144px;
}
#seachTip .seachB{
background-image: url(../images/guide21.png);
width: 647px;
height: 405px;
left: 324px;
top: 3px;
}
.seachB a{
left: 148px;
top: 308px;
}
.seachB span{
left: 332px;
top: 198px;
}
/*#seachTip .seachC{
background-image: url(../images/guide21.png);
width: 647px;
height: 405px;
left: 324px;
top: 3px;
}
.seachC a{
left: 148px;
top: 308px;
}
.seachC span{
left: 332px;
top: 198px;
}*/
#seachTip .seachD{
background-image: url(../images/guide31.png);
width: 654px;
height: 257px;
left: 318px;
top: 292px;
}
.seachD a{
left: 404px;
top: 156px;
}
.seachD span{
left: 589px;
top: 44px;
}
#seachTip .seachE{
background-image: url(../images/guide41.png);
width: 558px;
height: 348px;
left: 163px;
top: 79px;
}
.seachE a{
left: 308px;
top: 247px;
}
</style>
<!-- <script type="text/javascript" src="js/jquery-1.7.min.js"></script> -->
<script type="text/javascript">
window.onload=function(){
var omask=document.getElementById("mask");
var oseachTip=document.getElementById("seachTip");
var oseach=oseachTip.getElementsByTagName("div");
var oA=oseachTip.getElementsByTagName("a");
var oclose=oseachTip.getElementsByTagName("span") ;
// 读取cookie
var reg=document.cookie.substring(5);
alert(reg);
if(reg!="www.open.com.cn"){
// mask 父框 及第一个引导块显示出来
omask.style.display=oseachTip.style.display=oseach[0].style.display="block";
// 下一步按钮
for(var i=0;i<oseach.length;i++){
oA[i].index=i;
oA[i].onclick=function(){
this.parentNode.style.display="none";
if(this.index<oseach.length-1){
oseach[this.index+1].style.display="block";
}
else if(this.index==oseach.length-1){
oMask.style.display="none";
this.style.display=oSearch.style.display="none";
}
}
}
// 关闭按钮
for(var i=0;i<oclose.length;i++){
oclose[i].onclick=function(){
omask.style.display=oseachTip.style.display="none";
}
}
/* 添加cookie;*/
var oDate=new Date();//先new一个实例时间对象
oDate.setDate(oDate.getDate()+30);//先得到这个失效时间，再强制给他设置成30天；
document.cookie="name=www.open.com.cn;expires="+oDate;
}
}
</script>
</head>
<body>
<div id="mask"></div>
<div id="seachTip">
<div class="seachA"><a>下一步</a><span title="关闭">关闭</span></div>
<div class="seachB"><a>下一步</a><span title="关闭">关闭</span></div>
<!-- <div class="seachC"><a>下一步</a><span title="关闭">关闭</span></div> -->
<div class="seachD"><a>下一步</a><span title="关闭">关闭</span></div>
<div class="seachE"><a>开始体验</a></div>
</div>
</body>
</html>
