wrap all post content images with extra tags

wrap_post_images

// behold the magic of regular expressions
// goes with http://www.cssplay.co.uk/menu/css3-photo-curl.html
function chiro_filter_images($content){

    return preg_replace('/<img (.*) \/>\s*/iU', '<b class="curl"><b><img \1 /></b></b>', $content);

}

add_filter('the_content', 'chiro_filter_images');