.fondoUp {
	background-image: url(up%20copia.jpg);
	background-repeat: repeat;
	background-position: center bottom;
}
.fondoDown {
	background-image: url(down.jpg);
	background-repeat: repeat;
	
}
.celdacentro {
	background-image: url(centronet.jpg);
	background-repeat: no-repeat;
	background-position: center center;
}


.fondomedio {
	background-image: url(medio.jpg);
	background-repeat: repeat;
	background-position: center center;
}