.fondo {
visibility:hidden;
position: fixed;
top:0px;
left:0px;
width: 100%;
height: 100%;
z-index: 9;
background-color: black;
opacity:0.5;
filter:alpha(opacity='50');
}
.cuerpo {
visibility:visible;
position: absolute;
top:0px;
left:0px;
width: 100%;
height: 100%;
z-index: 2;
text-align: center;
}
.intrusivo {
visibility:hidden;
position:fixed;
z-index: 15;
top:0px;
left:0px;
width: 100%;
height: 100%;
text-align: center;
}
.flash {
visibility:hidden;
z-index: 14;
}