window.addEvent('domready', function(ev) {
	
	var selectBox = $('discovery_activity').getParent().getParent();
	var fadeEffect = new Fx.Tween(selectBox, {'duration' : 'short'});	
	
	//default: do not display selectbox
	selectBox.setStyle('opacity', 0);
	
	//prepare selectbox and add custom events
	selectBox.addEvent('fadeIn', function(ev) {
		fadeEffect.start('opacity', 0, 1);
	});
	
	selectBox.addEvent('fadeOut', function(ev) {
		fadeEffect.start('opacity', 1, 0);
	});
	
	//handle events
	$$('.discoveryForm')[0].getElements('input').each(function(inputEl){
		inputEl.addEvent('click', function() {
			if(this.get('id') == 'discovery_activities')
			{
				selectBox.fireEvent('fadeIn');
			}
			else
			{
				if(selectBox.getStyle('opacity') == 1)
				{
					selectBox.fireEvent('fadeOut');
				}
			}
		});
	});
});