JS Cookies

// Cookie for current question
        function create_cookie(name, value, days2expire, path) {
          var date = new Date();
          date.setTime(date.getTime() + (days2expire * 24 * 60 * 60 * 1000));
          var expires = date.toUTCString();
          document.cookie = name + '=' + value + ';' + 'expires=' + expires + ';' + 'path=' + path + ';';
        }
        function retrieve_cookie(name) {
          var cookie_value = "",
            current_cookie = "",
            name_expr = name + "=",
            all_cookies = document.cookie.split(';'),
            n = all_cookies.length;
         
          for(var i = 0; i < n; i++) {
            current_cookie = all_cookies[i].trim();
            if(current_cookie.indexOf(name_expr) == 0) {
              cookie_value = current_cookie.substring(name_expr.length, current_cookie.length);
              break;
            }
          }
          return cookie_value;
        }
        function delete_cookie(name) {
          document.cookie = name + "=; expires=Thu, 01 Jan 1970 00:00:00 GMT; path=/";
        }