function margin(element, amount ) { 
	var fx = new Fx.Styles(element, {duration:200, wait:false});
 	element.addEvent('mouseenter', function(){
		fx.start({
			'margin-left': amount
		});
	});
	element.addEvent('mouseleave', function(){
		fx.start({
			'margin-left': 0
		}); // fx.start
	}); // addEvent
}