function setCookie(sName, sValue) {
        var today = new Date(), expires = new Date();
        expires.setTime(today.getTime() + (30*60*1000));
        document.cookie = sName + "=" + sValue + ";expires=" + expires.toGMTString() + ";path=/";
}

     
function getCookie(sName) {
        var oRegex = new RegExp("(?:; )?" + sName + "=([^;]*);?");
 
        if (oRegex.test(document.cookie)) {
                return decodeURIComponent(RegExp["$1"]);
        } else {
                return null;
        }
}