ask Show / hide?

it is myButton


<td><?php  echo CHtml::Button('NEXT',array('name'=>'add','id'=>'onNext')); ?>

</td>

it’s my javascript


<script>

	$("#onNext").change(function()

	{

		if($(this).val() == 'onNext')

			$("#onSite").removeAttr("style");

			$("#onSite").attr("style","display:none");

	});

</script>

show hide why I did not show up?

sorry my english is not good , because I use google translate

Buttons usually fire a "click" event, not a "change" event.