#overlay {
  background: #000;
  filter: alpha(opacity=50);
  opacity: 0.5;
  display: none;
  position: fixed;
  top: 0px;
  left: 0px;
  width: 100%;
  height: 100%;
  z-index: 100;
  display:none;
  _background-color:#a0a0a0;
}

#myAlert1{
  	 width:20%;
        position: absolute;
        left:50%;
        top:50%;
        margin-left:-100px;
        margin-top:-100px;
        z-index:9999;
        background-color: #ffffff;
        color:#000000;
}