function checkDomain(searchForm)
{
  var can_submit = false;

  if (searchForm.domainToCheck)
  {
    var searchValue = searchForm.domainToCheck.value;
    if (searchValue != '')
    {
      var regExInvalidChars = /[^a-zA-Z0-9-\s.]+/;
      if (regExInvalidChars.test(searchValue))
      {
        alert('Invalid character in domain.\n\nOnly letters, numbers or hyphens are allowed.');
      }
      else
      {
        can_submit = true;
      }
    }
  }

  return can_submit;
}