.overlay { position: absolute; top: 0; left: 0; background: #000; filter:alpha(opacity=30); opacity: 0.3; -moz-opacity:0.3; }
.modal { position: absolute; overflow: hidden; display: none; top: 50%; left: 50%; background: #FFF; width: 700px; height: 520px; margin: -260px 0 0 -350px; }