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if ($("input[name='fileType']:checked").length > 0) {
  // one ore more checkboxes are checked
}
else {
 // no checkboxes are checked
}

if ($("input[name='MSTGRN_Notif_SendMail']:checked").val().toUpperCase() == "BALFON") {
  $("#MSTGRN_Notif_Balfon").parents("tr").show();
} else {
  $("#MSTGRN_Notif_Balfon").parents("tr").hide();
}