On Fri, 28 Dec 2007 10:55:58 -0200, Alessandro Feijó wrote:

> I'm manipulating dynamicaly the content of a Combobox
> It starts empty, I set the values with jQuery, and when I click Submit, an error say something like 'invalid content, contact your administrator'
> There is any protection to prevent content different from the original possible values to an <select> ? 

Yes there is.
You need to specify $form['your_select_element']['#dangerous_skip_check'] = TRUE;
You then need to perform your own server-side validation on the posted value, since this leaves your form open to  invalid submissions.

Note that this flag has been removed from D6, where the recommended way is now to use FAPIs #ahah properties.