function cartel(theURL,winName,ancho,alto,features) {
  	var izq = (screen.width - ancho) / 2;
  	var arr = (screen.height - alto) / 2;
  	window.open(theURL, winName, 'width=' + ancho + ',height=' + alto + ',left=' + izq + ',top=' + arr + ',' + features);
	}
	
function frameset(theURL,winName,ancho,alto,features) {
  	var izq = (screen.width - ancho) / 2;
  	var arr = (screen.height - alto) / 2;
  	window.open(theURL, winName, 'width=' + ancho + ',height=' + alto + ',left=' + izq + ',top=' + arr + ',' + features);
	}