app/code/community/Aoe/TemplateHints/Model/Renderer/Opentip.php
public function init($wrappedHtml) {
        $helper = Mage::helper('aoe_templatehints'); /* @var $helper Aoe_TemplateHints_Helper_Data */

        $wrappedHtml .= '<script type="text/javascript">' . $helper->getSkinFileContent('aoe_templatehints/js/opentip.min.js') . '</script>';
        $wrappedHtml .= '<script type="text/javascript">' . $helper->getSkinFileContent('aoe_templatehints/js/excanvas.js') . '</script>';
        $wrappedHtml .= '<script type="text/javascript">' . $helper->getSkinFileContent('aoe_templatehints/js/aoe_templatehints.js') . '</script>';
        $wrappedHtml .= '<style type="text/css">' . $helper->getSkinFileContent('aoe_templatehints/css/aoe_templatehints.css') . '</style>';
        $wrappedHtml .= '<style type="text/css">' . $helper->getSkinFileContent('aoe_templatehints/css/opentip.css') . '</style>';

        return $wrappedHtml;
    }
public function init($wrappedHtml) {
        $helper = Mage::helper('aoe_templatehints'); /* @var $helper Aoe_TemplateHints_Helper_Data */

        $wrappedHtml .= '<script type="text/javascript">' . $helper->getSkinFileContent('aoe_templatehints/js/opentip.min.js') . '</script>';
        $wrappedHtml .= '<script type="text/javascript">' . $helper->getSkinFileContent('aoe_templatehints/js/excanvas.js') . '</script>';
        $wrappedHtml .= '<script type="text/javascript">' . $helper->getSkinFileContent('aoe_templatehints/js/aoe_templatehints.js') . '</script>';
        $wrappedHtml .= '<style type="text/css">' . $helper->getSkinFileContent('aoe_templatehints/css/aoe_templatehints.css') . '</style>';
        $wrappedHtml .= '<style type="text/css">' . $helper->getSkinFileContent('aoe_templatehints/css/opentip.css') . '</style>';

        return $wrappedHtml;
    }
Init

@param $wrappedHtml
@return string|void