body { background-image: url("trozofondo.jpg");
       background-repeat: repeat;
}
div#flash {
    position: absolute;
    left: 50%;
    top: 50%;
    width: 780px;
    height: 680px;
    margin-top: -340px;
    margin-left: -390px;
	z-index: 2;
    overflow: auto;
        }
div#sombra{
	background-image: url("sombra.png");
	position: absolute;
    left: 50%;
    top: 50%;
    width: 810px;
    height: 710px;
    margin-top: -355px;
    margin-left: -405px;
	z-index: 1;
    overflow: auto;
}