function keyPressBusqueda(idBoton,evento) {
    try {            
        var oBoton = document.getElementById(idBoton);
        var iAscii;

        if (evento.keyCode) {
            iAscii = evento.keyCode;
        } else {            
                iAscii = evento.which;        
        }

        if (iAscii == 13) {

            evento.returnValue = false;
            __doPostBack('ctl00$btSearchRun', '');
            
        }        
        return true;
    }
    catch (Exception) {
        return false;
    }
}