Form is no defined error on CakePHP observefield functionality -


i´m gettin "form no defined" (firebug) on line:

new form.element.eventobserver('tareaproyectoid', function(element, value) {new ajax.updater('tareahitoid','/cake/tareas/update_region_select', {asynchronous:true, evalscripts:true, oncomplete:function(request, json) {effect.appear('popularlist');}, parameters:form.element.serialize('proyectonombre'), requestheaders:['x-update', 'tareahitoid']})})

in view hace this:

        echo $this->form->input('proyecto_id',                         array(                             'label'=>'nombre proyecto:',                             'class'=>'required',                             'id'=>'proyectonombre',                             'name'=>'proyectonombre',                             'type'=>'select',                             'style'=>'width:100px'                         ));     echo $this->form->input('hito_id',                         array(                             'label'=>'nombre hito:',                             'class'=>'required',                             'id'=>'proyectonombre',                             'name'=>'proyectonombre',                             'type'=>'select',                             'style'=>'width:100px'                         ));     echo $ajax->observefield('tareaproyectoid',             array(                 'with'=>'form.element.serialize(\'proyectonombre\')',                 'url'=>'update_region_select',                 'update'=>'tareahitoid',                 'complete'=>"effect.appear('popularlist');",'onchange'=>true                 )             );

can me? in advance. ah cakephp versión 1.3

ok! forgot

<?php echo $javascript->link(array('prototype'));  ?>

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