window.addEvent('domready',function() { 

	if ($('extra_layer')!=null) {
		new SmoothScroll({duration:500}); 

		$('extra_layer').set('opacity','0').setStyle('display','block');

		/* scrollspy instance */ 
		var ss = new ScrollSpy({ 
			min: 100, 
			onEnter: function(position,enters) { 
				$('extra_layer').fade('in');
				$('cont_footer').set('styles', {'height': '174px'});
				$('container').set('styles', {'background-image': 'url(/eduvision/template/images/container_bottom_bg_l.gif)'});
			}, 
			onLeave: function(position,leaves) { 
				$('extra_layer').fade('out'); 
				$('cont_footer').set('styles', {'height': '109px'});
				$('container').set('styles', {'background-image': 'url(/eduvision/template/images/container_bottom_bg.gif)'});
			}, 
			container: window
		}); 
	}
});