function writeCookie(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;

            }



            function delCookie(name) {

                writeCookie(name,"",-1);

            }