/* CSS Document */
.principal{
	margin:0 auto;
	text-align:center;
	}
	
.fondoiz{
	background-image:url(fondoiz.jpg);
	background-position:top right;
	background-repeat:repeat-x;
	}
	
.fondoder{
	background-image:url(fondoder.jpg);
	background-position:top left;
	background-repeat:repeat-x;
	}