custom CSS theme option

<?php

if (!defined('DB_NAME')) {
    header('Location: ../../../');
}

function add_my_custom_css() {
    $mycustomcss = get_option('my_custom_css');
    if (!empty($mycustomcss)) {
        echo "\n<!-- My Custom CSS Start -->\n<style type=\"text/css\">\n/* Plugin Author: Salvatore Noschese\nDarkWolf: http://www.darkwolf.it/ */\n\n".$mycustomcss."\n</style>\n<!-- My Custom CSS End -->\n";
    }
}

function mccss_admin() {
    $dir_url = get_template_directory_uri();
    $icon_url = $dir_url."/images/css-icon.png";
    $plugin_page = add_menu_page(__('My Custom CSS Panel','mccss'),__('Custom CSS','mccss'), 'manage_options', 'my_custom_css', 'mccss_options', '', 61);
    add_action( 'admin_init', 'register_settings_mccss' );
    add_action( 'admin_head', 'mccss_syntax' );
}


function mccss_syntax() { ?>
<!-- Syntax Support Start -->
<link type="text/css" rel="stylesheet" href="<?php echo get_stylesheet_directory_uri()?>/syntax/codemirror.css"></link>
<link type="text/css" rel="stylesheet" href="<?php echo get_stylesheet_directory_uri()?>/syntax/default.css"></link>
<script language="javascript" src="<?php echo get_stylesheet_directory_uri()?>/syntax/codemirror.js"></script>
<script language="javascript" src="<?php echo get_stylesheet_directory_uri()?>/syntax/css.js"></script>
<!-- Syntax Support End -->
<?php }

// register settings
function register_settings_mccss(){
    register_setting('mccss_settings','my_custom_css');
}
function mccss_options() {
?>
<div class="wrap">
    <h2><?php _e('Custom CSS Options','mccss')?></h2>
    <form method="post" action="options.php">
    <?php settings_fields( 'mccss_settings' ); ?>
    <p><?php _e('Custom CSS Code:','mccss'); ?></p>
    <textarea name="my_custom_css" id="my_custom_css" dir="ltr" cols="100" rows="10" class="css"><?php echo get_option('my_custom_css');?></textarea>
    <script language="javascript">var editor = CodeMirror.fromTextArea(document.getElementById("my_custom_css"), { lineNumbers: true });</script>
    <p class="submit">
        <input type="submit" class="button-primary" value="<?php _e('Save') ?>" />
    </p>
    </form>
</div>
<?php
}

add_action('admin_menu', 'mccss_admin');
add_action('wp_head', 'add_my_custom_css');
load_plugin_textdomain('mccss', false, get_stylesheet_directory_uri() . '/lang/' );