window.addEvent('domready', function() {
	
	if( !document.all ) {
		var portfolioVerticalSlide = new Fx.Slide('portfolioNav');	
		
		$('buttonPortfolio').addEvent('mouseenter', function(e) {
			// You often will need to stop propagation of the event
			e.stop();
			portfolioVerticalSlide.slideIn();
		});
		
		$('buttonPortfolio').addEvent('mouseover', function(e) {
			// You often will need to stop propagation of the event
			e.stop();
			portfolioVerticalSlide.slideIn();
		});
		
		$('navigation').addEvent('mouseleave', function(e) {
			// You often will need to stop propagation of the event
			e.stop();
			portfolioVerticalSlide.slideOut();
		});
		
		portfolioVerticalSlide.hide();
	}
});