[jQuery] Excluding some children in a selector

I have the following structure for tr:
<tr id="world">
<td></td>
<td></td>
<td>
<input type="button" name="hello" value="hello" />
</td>
</tr>
I also have the following javascript:
$("#world tr").click(function() {
// do stuffs
});
Is there a way to prevent the above event from triggering when the
hello button is clicked?