function popUp(pagina){
	var
		wW = "800",
		wH = "600",
		wX = (screen.width - wW)/2,
		wY = (screen.height - wH)/2,
		other = ',toolbar=no,scrollbars=no,resizable=no,menubar=no,status=yes,directories=no,location=no',
		windowFeatures = 'width=' + wW + ',height=' + wH + ',left=' + wX + ',top=' + wY + other;

	window.open(pagina, "popUp", windowFeatures);
}

function recomienda(pagina){
	var
		wW = "275",
		wH = "177",
		wX = (screen.width - wW)/2,
		wY = (screen.height - wH)/2,
		other = ',toolbar=no,scrollbars=no,resizable=no,menubar=no,status=yes,directories=no,location=no',
		windowFeatures = 'width=' + wW + ',height=' + wH + ',left=' + wX + ',top=' + wY + other;

	window.open(pagina, "recomienda", windowFeatures);
}