function toggleVisibility (elementId)
{
  var cssClass = document.getElementById(elementId).className;
  
  switch (cssClass)
  {
    case 'advanced':
      document.getElementById(elementId).className = 'hidden';
      
      break;
      
    default:
      document.getElementById(elementId).className = 'advanced';
  }
}

function toggleCourses ()
{
  var active = document.getElementById('courses_basic').style.display != 'none' ? 'basic' : 'advanced';
  
  switch (active)
  {
    case 'basic':
      document.getElementById('courses_basic').style.display = 'none';
      document.getElementById('courses_advanced').style.display = 'block';
      
      break;
      
    case 'advanced':
      document.getElementById('courses_basic').style.display = 'block';
      document.getElementById('courses_advanced').style.display = 'none';
  }
}

function sortChange ()
{
  switch (document.getElementById('sort_1').value)
  {
    case "grade_final":
      document.getElementById('sort_2').style.display = 'block';
      
      break;
      
    default:
      document.getElementById('sort_2').value = '';
      document.getElementById('sort_2').style.display = 'none';
      
      break;
  }
}

function setRating (numberOfStars)
{
  rating = numberOfStars;
}

function hoverRating (numberOfStars)
{
  for (var i = 1; i <= 5; i++)
  {
    document.getElementById('school_comment_rating_' + i + '_img').src = imgPrefix + 'images/icons/star_' + (i <= numberOfStars ? 'blue' : 'grey') + '.gif';
  }
}