How can change wordpress defalut gallery layout using hooks?

We can menage wordpress gallery css or HTML just using this code.For your custom gallery layout, copy this code and paste it itno your themes function.php file
 /**
Create own custom gallery layout -raghu
*/
function custom_gallery( $output, $attr ){
    global $post, $wp_locale;
    static $instance = 0;
$instance++;
// We're trusting author input, so let's at least make sure it looks like a valid orderby statement
if ( isset( $attr['orderby'] ) ) {
    $attr['orderby'] = sanitize_sql_orderby( $attr['orderby'] );
    if ( !$attr['orderby'] )
        unset( $attr['orderby'] );
}
extract(shortcode_atts(array(
    'order'      => 'ASC',
    'orderby'    => 'menu_order ID',
    'id'         => $post->ID,
    'itemtag'    => 'div',
    'icontag'    => '',
    'captiontag' => 'p',
    'columns'    => 3,
    'size'       => 'full',
    'include'    => '',
    'exclude'    => ''
), $attr));
$id = intval($id);
if ( 'RAND' == $order )
    $orderby = 'none';
if ( !empty($include) ) {
    $include = preg_replace( '/[^0-9,]+/', '', $include );
    $_attachments = get_posts( array('include' => $include, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => $order, 'orderby' => $orderby) );
    $attachments = array();
    foreach ( $_attachments as $key => $val ) {
        $attachments[$val->ID] = $_attachments[$key];
    }
} elseif ( !empty($exclude) ) {
    $exclude = preg_replace( '/[^0-9,]+/', '', $exclude );
    $attachments = get_children( array('post_parent' => $id, 'exclude' => $exclude, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => $order, 'orderby' => $orderby) );
} else {
    $attachments = get_children( array('post_parent' => $id, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => $order, 'orderby' => $orderby) );
}
if ( empty($attachments) )
    return '';
if ( is_feed() ) {
    $output = "\n";
    foreach ( $attachments as $att_id => $attachment )
        $output .= wp_get_attachment_link($att_id, $size, true) . "\n";
    return $output;
}
$itemtag = tag_escape($itemtag);
$captiontag = tag_escape($captiontag);
$columns = intval($columns);
$itemwidth = $columns > 0 ? floor(100/$columns) : 100;
$float = is_rtl() ? 'right' : 'left';
$selector = "gallery-{$instance}";
$gallery_div = '';
$size_class = sanitize_html_class( $size );
$gallery_div = "<div id=\"$selector\" class=\"product-box-sec galleryid-{$id} gallery-columns-{$columns} gallery-size-{$size_class}\">";
$output = apply_filters( 'gallery_style', $gallery_div );
$i = 0;
foreach ( $attachments as $id => $attachment ) {
    $image = wp_get_attachment_image( $id, $size );
    $output .= "<{$itemtag} class=\"product-box\">";
    $output .= $image;
    //if ( $captiontag) {
        $output .= "
            <{$captiontag} class=\"wp-caption-text gallery-caption\">
            " . wptexturize($attachment->post_title) . "
            </{$captiontag}>";
   // }
    $output .= "</{$itemtag}>";
}
$output .= "
    </div>\n";
return $output;
}
add_filter('post_gallery', 'custom_gallery', 11, 2);

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