.fondosup {
	background-attachment: fixed;
	background-image: url(images/fondsup.jpg);
	background-repeat:  repeat-x;
	background-position: left bottom;
}
.fondoinf {

	background-attachment: fixed;
	background-image: url(images/fondoinf.jpg);
	background-repeat:  repeat-x;
	background-position: left top;
}