Add custom shortcode button to Editor

I found it, WordPress made changes and you can now add buttons through a simple API

if( !function_exists('_add_my_quicktags') ){
    function _add_my_quicktags()
    { ?>
        <script type="text/javascript">
        /* Add custom Quicktag buttons to the editor WordPress ver. 3.3 and above only
         *
         * Params for this are:
         * string id Required. Button HTML ID
         * string display Required. Button's value="..."
         * string|function arg1 Required. Either a starting tag to be inserted like "<span>" or a callback that is executed when the button is clicked.
         * string arg2 Optional. Ending tag like "</span>"
         * string access_key Optional. Access key for the button.
         * string title Optional. Button's title="..."
         * int priority Optional. Number representing the desired position of the button in the toolbar. 1 - 9 = first, 11 - 19 = second, 21 - 29 = third, etc.
         * string instance Optional. Limit the button to a specific instance of Quicktags, add to all instances if not present.(optional)
         */
        QTags.addButton( 'php', 'PHP', '[ php gutter="false" ]', '[ /php]' );
        QTags.addButton( 'js', 'JS', '[ js gutter="false"]', '[ /js]' );
        QTags.addButton( 'h2', 'H2', '< h2>', '< /h2>' );
        QTags.addButton( 'h3', 'H3', '< h3>', '< /h3>' );
        QTags.addButton( 'promt', 'Prompt', function(){
            QTags.insertContent(window.prompt() )
        });

        </script>
    <?php }
    // We can attach it to 'admin_print_footer_scripts' (for admin-only) or 'wp_footer' (for front-end only)
    add_action('admin_print_footer_scripts',  '_add_my_quicktags');
}