function ampliar(A) {
	ancho = 816;
	alto = 708;
	
	ileft = (screen.availWidth - ancho) / 2;
	itop = (screen.availHeight - alto) / 2;
	window.open("ampliarIMG.php?A=" + A, "", "scroll=no, toobar=no, location=no, status=no, width=" + ancho + "px, height=" + alto + "px, left=" + ileft + ", top=" + itop);	
}