.fondoTabla {
	background-attachment: fixed;
	background-image: url(imagenes/fondo.gif);
	background-repeat: repeat-y;
	background-position: center top;
}
.fondoIzq {
	background-attachment: scroll;
	background-image: url(imagenes/izquierda.gif);
	background-repeat: repeat-y;
}
.fondoContenido {
	background-image: url(imagenes/fondo3.gif);
}