including js(and css) file from an element (to $scripts_for_layout )

Hi,
how to include js(and css) file from element (to
$scripts_for_layout )?
i tried the usual way i use from a view:
<?php echo $this->Html->css('xxxx',null,array('inline'=>false)); ?>
<?php echo $javascript->link('xxxx.js',false); ?>
but it doesnt work. I wonder why?
Can anyone help me on this issue?

Thanks

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