$(function(){
		
	var langs = $('ul.languages');
	var layers = $('div.features div.cols');
	var selected = langs.find('li.selected');
	var c = 'selected';
	
	langs.find('li').click(function(){
		var l, name, e = $(this);
		if (e.hasClass(c)) {
			return;
		} else {
			if (selected) {
				selected.removeClass(c);
				name = selected.attr('class');
				l = layers.find('div.' + name);
				l.hide();
			}
			name = e.attr('class');
			l = layers.find('div.' + name);
			l.show();
			e.addClass(c);
			selected = e;
		}
	})
	
});