function centraraula(){
	ancho=820;
	alto=650;
	anchotft=screen.width;
	altotft=screen.height;
	centradoizq=(anchotft-ancho)/2;
	centradotop=(altotft-alto)/2;
	self.moveTo(centradoizq,centradotop);
	self.resizeTo(ancho,alto);
		}
function abrirnumero(direccion){
	ancho=800;
	alto=600;
	anchotft=screen.width;
	altotft=screen.height;
	centradoizq=(anchotft-ancho)/2;
	centradotop=(altotft-alto)/2;
	centradito=centradoizq;
	caracteristicas='toolbar=yes,location=no,status=no,menubar=no,scrollbars=yes,resizable=yes';
	miventana=window.open(direccion,'',caracteristicas);
	miventana.moveTo(centradoizq,centradotop);
	miventana.resizeTo(ancho,alto);
	}