function adsense_shortcode( $atts ) {
        extract(shortcode_atts(array(
            'format' => '1',
        ), $atts));

        switch ($format) {
                case 1 :
                    $ad = '<script type="text/javascript"><!--
                        google_ad_client = "pub-6928386133078955";
                        /* 234x60, created 16/09/08 */
                        google_ad_slot = "0834408702";
                        google_ad_width = 234;
                        google_ad_height = 60;
                        //-->
                        </script>
                        <script type="text/javascript"
                        src="http://pagead2.googlesyndication.com/pagead/show_ads.js">
                        </script>';
                break;
        }
        return $ad;
}
add_shortcode('adsense', 'adsense_shortcode');