刷新不變化的樹形菜單

<!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>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>刷新不變化樹形菜單 - 未寺客JS</title>
<style type="text/css">
body,td,th {font-size: 14px;}
.leftmenu1 {font-weight: bold; cursor: hand; padding-top: 4px; height: 29px; text-align: left;}
.leftmenu2 {PADDING-LEFT:15px; height: 21px;text-align: left;}
div{ margin-top:90px; width:100%; text-align:center; }
</style>
</head>
<body>
<div>
<script language="JavaScript" type="text/javascript">
function Show(id,i_id){
        var on_img="http://www.cbiw.com.cn/member/pic/ass04.gif";//打開時圖片
        var off_img="http://www.cbiw.com.cn/member/pic/ass03.gif";//隱藏時圖片
        var obj=document.getElementById('c_'+id);
        if(obj.style.display=="none"){
                obj.style.display="";
        i_id.src=on_img;
        //將子菜單Id放入Cookies
        var curShow = readCookie('curShow');
        if(curShow!='')
        {
          var arr_curShow = curShow.split(',');
          var found = false;
          for(i=0;i<arr_curShow.length-1;i++)
          {
            if(arr_curShow[i].toString()==id) {found=true;}
          }
          if(!found){writeCookie('curShow',curShow+','+id,12)}
        }
        else {
          writeCookie('curShow',id,12)
        }
        //將子菜單Id放入Cookies End
        }else{
                obj.style.display="none";
        i_id.src=off_img;
        //將子菜單Id從Cookies中移除
        var curShow = readCookie('curShow');
        if(curShow!='')
        {
          var arr_curShow = curShow.split(',');
          for(i=0;i<arr_curShow.length;i++)
          {
            if(arr_curShow[i].toString()==id) {arr_curShow=arr_curShow.del(i--);}
          }
          curShow = arr_curShow.join(',');
          //alert(curShow);
          writeCookie('curShow',curShow,12)
        }
        //將子菜單Id從Cookies中移除 End
        }

}

function readCookie(name)

{

var cookieValue = "";

var search = name + "=";

if(document.cookie.length > 0)

{

offset = document.cookie.indexOf(search);

if (offset != -1)

{

offset += search.length;

end = document.cookie.indexOf(";", offset);

if (end == -1) end = document.cookie.length;

cookieValue = unescape(document.cookie.substring(offset, end))

}

return cookieValue;

}

function writeCookie(name, value, hours)

{

var expire = "";

if(hours != null)

{

expire = new Date((new Date()).getTime() + hours * 3600000);

expire = "; expires=" + expire.toGMTString();

}

document.cookie = name + "=" + escape(value) + expire;

}
Array.prototype.del=function(n) { //n表示第幾項，從0開始算起。
//prototype爲對象原型，注意這裏爲對象增加自定義方法的方法。
if(n<0) //如果n<0，則不進行任何操作。
return this;
else
return this.slice(0,n).concat(this.slice(n+1,this.length));
}