Rails - Sep 2006 - Using :function with observe_field helper

I am trying to use observe_field to get the famous 37signals YFT effect 
on form fields as they are modified.  So, in effect, I want to detect 
that a field has changed, and then cause the Prototype Highlight effect 
to happen on that field.

I am trying to do it using a statement like this:

<%= observe_field("preferences_x",
:function => visual_effect(:highlight, "preferences_x")) %>

which generates:

<script type="text/javascript">
//<![CDATA[
new Form.Element.EventObserver(''preferences_x'',
function(element, value)
{new Effect.Highlight("preferences_x",{});})
//]]>
</script>

I can sort of see that what I''ve provided for the function parameter is
not correct.  But to be honest, I''m not exactly sure what the problem
is
here.

Has anyone successfully used the :function argument to observe_field?

Thanks,
Wes

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I wanted to be able to call observe_field in a loop to set up 
script.aculo.us effects on all of the form fields in my form.

But I couldn''t get it to work, so I just threw identical onChanges on 
each field.

If anyone has ever successfully used the :function option to 
observe_field, I''d love to understand how it''s done.

Thanks,
Wes


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