This extension for Magento allows to include external JavaScripts and CSS to HTML page head using layout files.
Usage example:
<action method="addItem"><type>absolute_js</type><name>http://stg.odnoklassniki.ru/share/odkl_share.js</name></action>
<action method="addItem"><type>absolute_css</type><name>http://stg.odnoklassniki.ru/share/odkl_share.css</name></action>