function init_menu() {
	var hoverables = document.getElementsByClassName('hoverable');
	bind_hovers(hoverables);
}

function bind_hovers(items) {
	items.each(function(item) {
		Event.observe(item,'mouseover',function() {
			Element.addClassName(this,'hover');
		}.bind(item));

		Event.observe(item,'mouseout',function() {
			Element.removeClassName(this,'hover');
		}.bind(item));
	});
}

Event.observe(window,'load',init_menu);