function validateAndSubmit()
{    
  if (document.forms[0].fileClass.length == null)
  {
    if (document.forms[0].fileClass.checked == false)
    {
      alert("At least one selection is required before proceeding.");
      return;
    }
  }
  else
  {
      // Assume none checked.
      var c = 0;

      for (var i = 0; i < document.forms[0].fileClass.length; i++)
      {
        if (document.forms[0].fileClass[i].checked == true)
        {
          c = 1;
          break;
        }
      }

      if (c == 0)
      {
        alert("At least one selection is required before proceeding.");
        return;
      }
  }

  document.forms[0].submit();
}