js_COOKIE

//设定COOKIE
function setCookie(cookieName,cookieValue)
{
    var str = cookieName + "=" + escape(cookieValue) + "; path=/;";
var date = new Date();
var ms = 30*60*1000;
date.setTime(date.getTime() + ms);
    str += "; expires=" + date.toGMTString();
    document.cookie = str;
};

//得到COOKIE的值
function getCookie(cookieName)
{
var arrayCookie = document.cookie.split("; ");
for(var i = 0; i < arrayCookie.length; i++ )
{
  var arrName = arrayCookie[i].split("=");
  if(arrName[0] == cookieName)
  {
    return unescape(arrName[1]);
  }
}