var Engine = new Class({ 
 		 		
	    initialize: function(){ 
	    	if( $$('.sub-content-nav ul').length > 0 ) {
		    	this.subContentToggle();
		    }
	    	
	    }, 
	 
	 	subContentToggle: function() {
	 		var subContentLinks = $$('.sub-content-nav ul')[0].getElements('a');
	 		subContentLinks.addEvent('click', function(e) {
	 			e.stop();
	 			
	 			// Set proper menu element as active
	 			$$('.sub-content-nav ul li').removeClass('selected');
	 			this.getParent().addClass('selected');
	 			
	 			// Show selected content
	 			$$('.sub-content-element').each( function(elem) { 
	 				if( !elem.hasClass('hidden') ) {
	 					elem.addClass('hidden'); 
	 				} 
	 			});
	 			
	 			$('subcontent-' + this.get('class') ).removeClass('hidden');
	 			
	 		});
	 	}
	}); 
	
	window.addEvent('domready', function() {
		var engine = new Engine();
	});