radio button + ajaxHelper::observeField() - clicking second time no action WHY??

I'm using radio button + ajaxHelper::observeField() to change
display .

There are about 5 radio buttons. When I click one of them first time,
working fine then I click the other one, still working fine but when I
click again first one I clicked, I don't see any update. If I click
other radio button, they still work fine. The radio button works only
first time it clicked then stop working after that.

code are similar to this below:
============================================================================
<?php
for($i=1; $i<6; $i++){
?>
<input type="radio" name="test" id="test<?=$i?>" /> test<?=$i?>

<?php
$options = array('url'=>'/test/ajax_test',
'update'=>'ajax_test');
echo $ajax->observeField('test' . $i, $options );
?>

<?php } ?>

<div id="ajax_test"></div>
============================================================================

I have similar code for drop down list and working fine but in this
specific page I prefer using radio button and not working as I
expected.
How can I make it work even I clicked them 2nd and 3rd time?

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