/* [listing 6-17] */
#alert {
     position: absolute;
     top: 50%;
     left: 0;
     width: 100%;
     text-align: center;   
     display: none;
}

#alert p {
     width: 230px;
     margin: 0 auto 0 auto;
     padding: 10px;
     background: white;
     border: 1px solid #aaa;
}
/* [listing 6-17 end] */

body.loading #alert { display: block; }