var wfi_topnav = new Class({
	attach: function(anchor, menu) {
		var klass = this;

		$(anchor).addEvents({
			'mouseenter': function() { klass.toggle(menu, true); },
			'mouseleave': function() { klass.toggle(menu, false); }
		});
		
		return this;
	},
	
	toggle: function(element, flag) {
		$(element).setStyle(
			'display',
			(flag ? 'block' : 'none')
		);
	}
});

window.addEvent('domready', function(){
	new wfi_topnav()
		.attach('get-details-city',    'get-details-city-list')
		.attach('get-details-service', 'get-details-service-list')
	;
});