Access a returned AJAX value

Hi,

I have the following situation:
A view where I call an AJAX helper with following options:

<?php $options = array(
'url' => array('controller' => 'users', 'action'=>'login'),
'before' => 'startLoadingLogin()',
'complete' => 'endLoadingLogin()',
'failure' => 'alert(\'Error\')'
);
?>

Once the AJAX call is completet the JS function endLoadingLogin() is
called. In this function I want to access a return value that I wrote
in the controller like this:

echo "1";
$this->render(null,'ajax');

How can I access the return value of this AJAX call in my
endLoadingLogin() function?

I have tried accessing things like:

var response = t.responseXML.documentElement;
var response = oXmlHttp.responseText;

in endLoadingLogin() but they don't seem to work and I don't see how
they should work anyway, because there is no connection between the
response variable and the AJAX call...

Any ideas are highly appreciated!

cheers,
tobi_one
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