Are there known problems with iPhone and Ajax?

I am trying to debug a problem with an Ajax form submit,
using  
Prototype 1.5.1.1.

On Safari 2 and Firefox 2 (Mac) everything works. On the
iPhone, the  
form submit is trapped but the Ajax submit does not appear
to run.

I am imagining that this might be a timing issue. The form
listener  
is added with an inline script, within the body of a div
that is  
being populated by Ajax Updater. Is it possible that the
script  
evaluation is failing part-way through?

Here's the inline script.

$('new_thread').observe('submit',function(evt){
	new Ajax.Updater('reply_form','form.php',{parameters: $ 
('new_thread').serialize(true),evalScripts:true});
	Event.stop(evt);
});

The only part that seems to work on all browsers is the
Event.stop.  
That is to say, the form does nothing at all in the iPhone
browser.  
When I comment out that Event.stop, the form submits to its
actual  
target in iPhone and on the desktop. Are there any ideas
about why  
the form submit part might work on the desktop but not on
the phone?

Walter

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