.imagen_derecha{
	float:right;
	clear:both;
	margin-left:20px;
	padding-left:20px;
	border-left: 1px solid #cccccc;
	margin-bottom:20px;
}

.imagen_izquierda{
	float:left;
	clear:both;
	margin-right:20px;
	padding-right:20px;
	border-right: 1px solid #cccccc;
	margin-bottom:20px;
}