Hey,

Use the callback option, which works like Ajax.Autocompleter's: you 
specify a function of yours that will take two arguments: the form 
element created for IPE and the editable field's value.  It's in charge 
of returning the serialized parameters.  The default implementation just 
does:

   callback: function(form) { return Form.serialize(form); }

You can use that to bind in your own stuff, like:

   callback: function(form, value) {
     var data = Form.serialize(form, true);
     data.merge({ myParam1: value1, myParam2, value2 /*...*/ });
     return data.toQueryString();
   }

Or if you're more into serialized forms already (which means you take 
care of URL-encoding yourself, ugh):

   callback: function(form, value) {
     return Form.serialize(form) + 'myParam1=value1&myParam2=value2';
   }

(Obviously here, we don't URl-encode anything, but you may need to).

'HTH

-- 
Christophe Porteneuve aka TDD
[EMAIL PROTECTED]

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