function getCookie(c_name){
            var c_value = document.cookie;
            var c_start = c_value.indexOf(" " + c_name + "=");
            if (c_start == -1){
                c_start = c_value.indexOf(c_name + "=");
            }
            if (c_start == -1){
                c_value = null;
            }else{
                c_start = c_value.indexOf("=", c_start) + 1;
                var c_end = c_value.indexOf(";", c_start);
                if (c_end == -1){
                    c_end = c_value.length;
                }
                c_value = unescape(c_value.substring(c_start,c_end));
            }
            return c_value;
        }
        function setCookie(c_name,value,exdays){
            var exdate=new Date();
            exdate.setTime(exdate.getTime()+(exdays*60*60*1000));
            var c_value=escape(value) + ((exdays==null) ? "" : "; expires="+exdate.toUTCString());
            document.cookie=c_name + "=" + c_value;
        }