function createCookie(name,value,days) {
            if (days) {
                var date = new Date();
                date.setTime(date.getTime()+(days*24*60*60*1000));
                var expires = "; expires="+date.toGMTString();
            } else {
                var expires = "";
            }
            document.cookie = name+"="+value+expires+"; path=/";
        }
        function readCookie(name) {
            var nameEQ = name + "=";
            var ca = document.cookie.split(';');
            for(var i=0;i < ca.length;i++) {
                var c = ca[i];
                while (c.charAt(0)==' ') {
                    c = c.substring(1,c.length);
                }

                if (c.indexOf(nameEQ) == 0) {
                    return c.substring(nameEQ.length,c.length);
                }
            }
            return null;
        }