function getChange()
{
  if ($F('xchUnit').length > 0)
    {
    $('xchInfo').innerHTML = 'Kis türelmet..';
    var unit	= $F('xchUnit');
		var from	= $F('xchFrom');
		var to		= $F('xchTo');
		var url   = './ajax/exchange.phtml';
		var pars  = 'fejezet=55&alfejezet=4&unit=' + unit + '&from=' + from + '&to=' + to;
		var myAjax = new Ajax.Request(url, { method: 'get',
										                     parameters: pars,
										                     onComplete: showResponse,
									                       onFailure: reportError
									                     });
    }
  else
    {
    alert('Kérem adjon meg egységet.');
    }
}
function showResponse(request)
{
  $('xchInfo').innerHTML = '';
  alert(request.responseText);
}
function reportError(request)
{
	$('xchInfo').value = 'hiba';
}

/*
function kheToplistChange(event)
{
  changed_select = Event.element(event);
  form = changed_select.up('form');
  form.submit();
}

Event.observe(window, "load", function() {
  if ($('kheChannelToplist')){Event.observe('kheChannelToplist','change',kheToplistChange);}
});
*/