// Effet de brillance sur les images au passage de la souris
function opacOn(element) { 
  	new Effect.Opacity(element, { from: 0.5, to: 1, duration: 0.6 });
	return false;
}
function opacOff(element) { 
  	new Effect.Opacity(element, { from: 1, to: 1, duration: 0.3 });
	return false;
}