Eliminar JS del header

<script type="text/javascript" src="/media/system/js/mootools.js"></script>
<script type="text/javascript" src="/media/system/js/caption.js"></script>

<?php 
//remove mootools.js and caption.js
$headerstuff=$this->getHeadData();
reset($headerstuff['scripts']);
foreach($headerstuff['scripts'] as $key=>$value){
	unset($headerstuff['scripts'][$key]);
}		
$this->setHeadData($headerstuff);
?>