function ventana (URL){
      refVentana = window.open(URL,"ventanaEmpresa","width=390,height=500,top=70,left=500, scrollbars=yes, menubar=NO,toolbar=NO");
}

function ventana_ancha (URL){
      refVentana = window.open(URL,"ventanaEmpresa","width=520,height=500,top=70,left=420, scrollbars=yes, menubar=NO,toolbar=NO");
}

function ventanita (URL){
      refVentana = window.open(URL,"Recomienda esta página","width=400,height=250,top=70,left=500, scrollbars=yes, menubar=NO,toolbar=NO");
}