function removeLightBox()
{
	new Effect.Opacity('layer_overlay', { to: 0, duration: 0.5, afterFinish: function (){ $('layer_overlay').remove(); }});
	new Effect.Opacity('layer_ad', { to: 0, duration: 0.5, afterFinish: function (){ $('layer_ad').remove(); }});
}

document.observe('dom:loaded', function() {

	Event.observe('layer_overlay', 'click', function(e){
		removeLightBox();
	});
	Event.observe('layer_close', 'click', function(e){
		Event.stop(e);
		removeLightBox();
	});
});