function executeKey(campo,codigoTecla,metodo){
	function key(e){
		e = (e) ? e: window.event;
		var tecla = e.keyCode;
		   
		if    (tecla == codigoTecla){
				metodo();
		}
	}
	addEventListener(campo,"keypress",key);
	//onkeypress
}

function addEventListener(obj, evType, fn, useCapture){
  if (obj.addEventListener){
    obj.addEventListener(evType, fn, useCapture);
    return true;
  } else if (obj.attachEvent){
    var r = obj.attachEvent("on"+evType, fn);
    return r;
  } else {
    alert("Handler could not be attached");
  }
}