To avoid scripts loading more than once from different portlet windows you can define additional scripts in jboss-portlet.xml. *Note the "rfRes" URI prefix that is mapped in the web.xml.

    <portlet>
        <portlet-name>ajaxPortlet</portlet-name>
        <header-content>
            <script src="/faces/rfRes/org/ajax4jsf/framework.pack.js" type="text/javascript"></script>
            <script src="/faces/rfRes/org/richfaces/ui.pack.js" type="text/javascript"></script>
            <link rel="stylesheet" type="text/css" href="/faces/rfRes/org/richfaces/skin.xcss"/>
        </header-content>
    </portlet>