function setCookie(cookieName, cookieContent, cookieExpireTime) {
    if(cookieExpireTime>0){
        var expDate=new Date();
        expDate.setTime(expDate.getTime()+cookieExpireTime*1000*60*60);
        var expires=expDate.toGMTString();
        document.cookie=cookieName+"="+escape(cookieContent)+"; path="+escape('/')+"; expires="+expires;
    }else{
        document.cookie=cookieName+"="+escape(cookieContent)+"; path="+escape('/')+"";
    }
}

function getCookie(cookieName){
    var ourCookie=document.cookie;
    if(!ourCookie || ourCookie=="")return "";
    ourCookie=ourCookie.split(";");
    var i=0;
    var Cookie;
    while(i<ourCookie.length){
        Cookie=ourCookie[i].split("=")[0];
        if(Cookie.charAt(0)==" ")
                Cookie=Cookie.substring(1);
        if(Cookie==cookieName){
            return unescape(ourCookie[i].split("=")[1]);
        }
        i++;
    }
    return "";
}

var PageNum = 0;
if(getCookie('PageNum') != "") PageNum=getCookie('PageNum'); else {
  PageNum = Math.floor((Math.random()*0.9999) * 4)+1;
  setCookie("PageNum",PageNum,168);
  if(getCookie("PageNum")=="") PageNum=1;
}