// JavaScript Document
Event.observe(window, 'load', function() {
	Event.observe($('nav'), 'click', function(event) {
		var element = Event.element(event);
  		if ('IMG' == element.tagName && element.up('h2').next(0).tagName == 'UL'){
			Effect.toggle(element.up('h2').next(0),'blind',{duration:0.5});
			if(element.up('h2').next(0).visible())
			{element.src = element.src.replace('_close.gif','.gif');}
			else
			{element.src = element.src.replace('.gif','_close.gif');}
		}
	});
});