window.addEvent('domready', function() {

	$$('#topnav a').each(function(el,i){

		var navFx = new Fx.Tween (el, {duration: 150, link:'cancel', property: 'opacity'});
		navFx.set(".5")

		el.addEvent('mouseenter', function(){
			navFx.start(1);
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		el.addEvent('mouseleave', function(){
			navFx.start(.5);
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	});
	
});