function updateSeasonDisplay(ctrlName) {
  var numSeasons = document.getElementById('numSeasons').value;
  var selectedSeason = document.getElementById(ctrlName).value;
  for (var ctr = 1; ctr <= numSeasons; ctr++)
  {
    document.getElementById('season' + ctr + 'div').style.display = (selectedSeason == 'season' + ctr) ? '' : 'none';
  }
}

function setClass(ctrlName, cssClass)
{
  document.getElementById(ctrlName).className = cssClass;
}