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

var addOpinion = new Fx.Slide('add_op');
addOpinion.hide();

$('add_button').addEvent('click', function(e){
e.stop();
addOpinion.toggle();

});

addOpinion.addEvent('complete', function() {
	$('add_button').setStyle('display' , 'none');
	});

});