切换rich：datascroller的CSS

<f:facet name=\"footer\">
    <a4j:form>        
        <rich:datascroller styleClass=\"wrap-paginacao\" for=\"estabelecimentoGrid\" boundaryControls=\"hide\" stepControls=\"show\"  fastControls=\"hide\"  >
            <f:facet name=\"previous\">
                <h:graphicImage value=\"/home/img/previous.png\"/>
            </f:facet>

            <f:facet name=\"next\">
                <h:graphicImage value=\"/home/img/next.png\"/>
            </f:facet>
        </rich:datascroller>
    </a4j:form>  
</f:facet>