body {
}
#ModelPopupBackground1 {
    position:fixed; 
    top:0px; 
    bottom:0px; 
    left:0px;
    right:0px;
    overflow:hidden; 
    padding:0; 
    margin:0; 
    background-color:#000; 
    filter:alpha(opacity=50); 
    opacity:0.5; 
    z-index:1000; 
}

#ModelPopupMessage1 { 
    position:fixed; 
    top:30%; 
    left:20%;
    padding:10px; 
    width:600px; 
    z-index:1001;
    background-color:#fff;
    border:solid 1px #000;
}