if(document.getElementById && document.createTextNode){

    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;
    }

    function eraseCookie(name) {
            createCookie(name,"",-1);
    }
}