WordPress add a theme options page

<?php
/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
add_action('admin_menu', 'my_theme_options_menu');

function my_theme_options_menu() {
    add_action('admin_print_scripts', 'my_options_admin_scripts');
    add_action('admin_print_styles', 'my_options__admin_styles');
    add_theme_page('My Plugin Theme', 'My Theme Options', 'administrator', 'my-theme-options', 'my_theme_options_function');
    add_action('admin_init', 'register_mysettings');
}

function register_mysettings() {
    //register our settings
    register_setting('my_theme_options', 'myoption');
}

function my_options_admin_scripts() {
    wp_enqueue_script('media-upload');
    wp_enqueue_script('thickbox');
    wp_enqueue_script('my-upload');
}

function my_options__admin_styles() {
    wp_enqueue_style('thickbox');
}

function my_theme_options_function() {
    if (!current_user_can('manage_options')) {
        wp_die(__('You do not have sufficient permissions to access this page.'));
    }
    $my_theme_options = get_option('myoption');
    if ($my_theme_options[logo] == '')
        $my_theme_options[logo] = 'http://fakeimg.pl/150x100/?text=W&font=lobster';
    if ($my_theme_options[favicon] == '')
        $my_theme_options[favicon] = 'http://fakeimg.pl/16x16/?text=W&font=lobster';
    ?>
    <div class="wrap"> 
    <?php screen_icon(); ?>
        <h2>My Theme Options</h2>
        <form method="post" id="my_theme_options" action="options.php"> 
    <?php
    settings_fields('my_theme_options');
    ?> 
            <table class="form-table" id="my_theme_options">
                <tr><th scope="row">Logo</th>
                    <td><input type="text" id="my_logo" class="image_upload"  name="myoption[logo]" value="<?php echo $my_theme_options[logo]; ?>" >
                    </td>
                    <td><img src="<?php echo $my_theme_options[logo]; ?>" > </td>
                </tr>
                <tr><th scope="row">Favicon</th>
                    <td><input type="text" id="my_favicon"  class="image_upload"  name="myoption[favicon]" value="<?php echo $my_theme_options[favicon]; ?>" ></td>
                    <td><img src="<?php echo $my_theme_options[favicon]; ?>" > </td></tr>
                <tr><th scope="row" colspan="3"> <?php submit_button(); ?> </th>
                </tr>
            </table>
        </form>
    </div>
    <style>#my_theme_options input.image_upload { width: 100% } #my_theme_options img { max-width: 100px;}</style>
    <script>
        var $ =jQuery.noConflict();
        jQuery(document).ready(function($) {
            $('#my_theme_options input.image_upload').live("click",function(){
                formfield = $(this).attr('name');
                field_id = $(this).attr('id');
                preview_img = $(this).parent().next().find('img');
                //alert(field_id);
                tb_show('', 'media-upload.php?type=image&amp;TB_iframe=true');
                return false;
            });
            window.send_to_editor = function(html) {
                imgurl = $('img',html).attr('src');
                $("#"+field_id).val(imgurl);
                preview_img.attr("src",imgurl);
                tb_remove();
            }
        });
    </script>
    <?php
}
?>