Content rendering after javascript - Zend

I can't perform any js function fired by a dijit event unless setting the javascript file in the view itself.

I set various js files to use within my controller this way :

$layout = Zend_Layout::getMvcInstance();
$view = $layout->getView();
$view->headScript()
            ->appendFile('/public/js/jquery-1.5.1.min.js', 'text/javascript')
            ->appendFile('/public/js/jquery-ui-1.8.13.custom.min.js', 'text/javascript')
            ...
            ->appendFile('/public/js/functions.js', 'text/javascript');

which are echoed in the layout :

echo $this->headScript();

note : all of them are loaded

But when my view is rendered The events bound to the dijits elements don't fire the functions in functions.js

For example I have this dijit element :

$business = new Zend_Dojo_Form_Element_FilteringSelect('business');
        $business ->setLabel("Etablissement :")
            -> setStoreId('businessStore')
            -> setStoreType('dojo.data.ItemFileReadStore')
            -> setStoreParams(array('url' => '/public/business/getbusinesses?all=true&'))
            -> setAttrib('searchAttr', 'nom')
            -> setAttrib('onchange',"cB()")
            -> setRequired(true)
            -> setValue('business');

and the js function :

function cB() {
    alert("changed");
}

But even if I wrap cB() like this it doesn't work :

$(document).ready(function() {
    function cB() {
        开发者_开发百科alert("changed");
    }
});

Do somone has an idea ? I'm stuck with this javascript issue all over my Zend application =(

thanks !