function ClickAllgrades() {
  if (document.CurriculumSearch.allGrades.checked) {
    for (i = 0; i < document.CurriculumSearch.grades.length; i++)
      document.CurriculumSearch.grades[i].checked = false;
  }
}
function ClickOneGrade(pIdx) {
  if (document.CurriculumSearch.grades[pIdx].checked) {
   document.CurriculumSearch.allGrades.checked = false;
  }
}
function ClickAllsubjects() {
  if (document.CurriculumSearch.allSubjects.checked) {
    for (i = 0; i < document.CurriculumSearch.subjects.length; i++)
      document.CurriculumSearch.subjects[i].checked = false;
  }
}
function ClickOneSubject(pIdx) {
  if (document.CurriculumSearch.subjects[pIdx].checked) {
    document.CurriculumSearch.allSubjects.checked = false;
  }
}
function ClickAllTeachingMaterials() {
  if (document.CurriculumSearch.allTeachingMaterials.checked) {
    for (i = 0; i < document.CurriculumSearch.teachingMaterials.length; i++)
      document.CurriculumSearch.teachingMaterials[i].checked = false;
  }
}
function ClickOneTeachingMaterial(pIdx) {
  if (document.CurriculumSearch.teachingMaterials[pIdx].checked) {
    document.CurriculumSearch.allTeachingMaterials.checked = false;
  }
}