function switchSubject(elem)
{
  if( '' == elem.value )
  {
	document.getElementById('subjectChoiceTarget').innerHTML = '';
  }
  else
  {
	var target = document.getElementById('subjectChoiceTarget');
	var source = document.getElementById('subject_' + elem.value );
	if( null != target && null != source )
	{
	  target.innerHTML = source.innerHTML;
	}
	source = document.getElementById('subjectDescription_'+elem.value);
	target = document.getElementById('subjectDescriptionTarget');
	if( null != source && null != target )
	{
	  target.innerHTML = source.innerHTML;
	}
  }
}
function switchLoad(nr)
{
  if( '' != nr )
  {
    elem = document.getElementById('subjectChoiceSwitcher');
    elem.value = nr;
    switchSubject(elem);
  }
}