Theme id widget sidebar customization

Hi, I want to customize the widget sidebar so that image(button in my case) displays first, then title followed by text. This is code in functions.php. WHat modification should be done.

register_sidebar(array(
            'name' => __('Main Sidebar', 'themename'),
            'description' => __('Area 1 - sidebar.php', 'themename'),
            'id' => 'main-sidebar',
            'before_title' => '<div class="widget-title">',
            'after_title' => '</div>',
            'before_widget' => '<div id="%1$s" class="widget-wrapper %2$s">',
            'after_widget' => '</div>'
        ));

I have started to design for wordpress recently. Please guide me.