div#alertBg {
  display: none;
  position: absolute;
  top: 0;
  left: 0;
  background-color: #000;
  opacity: 0.8; /*Gecko*/
  filter: Alpha(opacity=80); /*IE 6+*/
  width: 100%;
  height: 100%;
  z-index: 99;
}

div#alertMain {
  display: none;
  position: absolute;
  top: 50px;
  left: 50px;
  width: 504px;
  height: 655px;
  padding: 10px;
  background-color: #ccc;
  z-index: 100;
  text-align: center;
}

div#alertMain div#alertFermer {
  font-weight: bold;
}

div#alertMain p#alertContinueMessage {
  clear: both;
  margin: 0 0 10px 0;
  width: 100%;
}