function displaySection(event) {
	$$('#howItWorks div:not(.hide)').each(function(div) {
		div.addClassName('hide');
	});
	$(Event.element(event).parentNode.id+'S').removeClassName('hide');
}

Event.observe(window, 'load', function() {
	$$('#howItWorksNav li').each(function(elt) {
		elt.observe('mouseover', displaySection);
	});
});