window.addEvent('domready', function(){
  initEditions();
});
function initEditions(){
  tabs = $$('#page .edition_title');
  if (tabs.length > 1) {
    tabs.each(function(tab){
      tab.addEvent('click', function(e){
        toggleEdition(e.target);
      });
    });
  }
}
function toggleEdition(eventTab){
  showEdition = $(eventTab.get('toggle'));
  $$('#page div.footer div.edition').each(function(edition){
    edition.setStyle('display', ((showEdition==edition) ? 'block' : 'none'));
  });
  $$('#page .edition_title').each(function(tab){
    if(tab == eventTab){
      tab.addClass('here')
    }else{
      tab.removeClass('here');
    }
  });
}