Remove mootool.js / captions.js from joomla 1.5 as per: https://coderwall.com/p/plp6qg

joomla-1.5-remove-mootoolsjs.php

        <?php
        /*
         * JE - 12.13.2012
         * The following snippet removes both mootools.js and caption.js from joomla
         * Found here: https://coderwall.com/p/plp6qg
         */
        defined('_JEXEC') or die;
        unset($this->_scripts[JURI::root(true).'/media/system/js/caption.js']);
        defined( '_JEXEC' ) or die( 'Access Denied.' );
        // Remove mootools and other scripts from header
        unset($this->_scripts[JURI::root(true).'/media/system/js/mootools.js']);
        //$this->_scripts = array();
        ?>