hidden fields after validate error

I'm using javascript and ajax to show/hide fields in a form depending
on the selected values of one or more fields.
The user chooses a value from a select and some other field is shown
or hidden.

When the user submits data and there's a validation error the form
reloads and the visibility value of the fields is lost.

Is there a cake way to reload the form the right way or I have to
rerun all the javascript code that checks values and hides/shows
fields?
(I know, I'm asking too much from cakephp...)

Thank you
maxx
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