(function($){
	window.addEvent('domready',function() {
		var opacity = 0.6, toOpacity = 1;
		$$('div.focus').set('opacity',opacity).addEvents({
			mouseenter: function() {
				this.tween('opacity',toOpacity);
			},
			mouseleave: function() {
				this.tween('opacity',opacity);
			}
		});
	});
})(document.id);