funSetOpacity = function(strElements) {
  arrElements = $$(strElements);
  arrElements.setStyle('opacity', .70);
  arrElements.addEvents({
    'mouseover': function() {
      objEffect = new Fx.Style(this, 'opacity', {'duration': 200});
      objEffect.start(1);
    },
    'mouseout': function() {
      objEffect = new Fx.Style(this, 'opacity', {'duration': 300});
      objEffect.start(.70);
    }
  });
}

window.addEvent('domready', function() {
  funSetOpacity('.brandLogo');
});