.img_gral_izq {
	background-image: url(imagenes/back_gral_izq.jpg);
	background-repeat: no-repeat;
	background-position: right top;
}
.img_gral_der {
	background-image: url(imagenes/back_gral_der.jpg);
	background-repeat: no-repeat;
	background-position: left top;
}
.img_end_izq {
	background-image: url(imagenes/back_end_izq.jpg);
	background-repeat: no-repeat;
	background-position: right top;
}
.img_end_der {
	background-image: url(imagenes/back_end_der.jpg);
	background-repeat: no-repeat;
	background-position: left top;
}
.img_head_izq {
	background-image: url(imagenes/back_head_izq.jpg);
	background-repeat: no-repeat;
	background-position: right top;
}
.img_head_der {
	background-image: url(imagenes/back_head_der.jpg);
	background-repeat: no-repeat;
	background-position: left top;
}
.img_proyecto {
	padding-top: 18px;
	text-align: center;
}