function collapse(id) {
    is_collapsed = $(id).hasClassName('collapsed');
	 if (is_collapsed == true) {
	   $(id).removeClassName('collapsed');		
		$(id+'-list').hide();
	 } else {
	   $(id).addClassName('collapsed');
		$(id+'-list').show();		
	 }
  }
  
function displayLanguageSelect() {
  $('language-selection').show();
}

function hideLanguageSelect() {
  $('language-selection').hide();
}

function displayReferencieRok() {
  $('referencie-rok-selection').show();
}

function hideReferencieRok() {
  $('referencie-rok-selection').hide();
}

window.onload = function() {
  $('language-selection').hide();
}