functions.php

<?php

    // Add RSS links to <head> section
    automatic_feed_links();

    // Load jQuery
    if ( !is_admin() ) {
       wp_deregister_script('jquery');
       wp_register_script('jquery', ("http://ajax.googleapis.com/ajax/libs/jquery/1.4.1/jquery.min.js"), false);
       wp_enqueue_script('jquery');
    }

add_theme_support( 'post-thumbnails' );
set_post_thumbnail_size( 550, 80, true ); // Normal post thumbnails
add_image_size( 'single-post-thumbnail', 550, 9999 ); // Permalink thumbnail size

    // Clean up the <head>
    function removeHeadLinks() {
        remove_action('wp_head', 'rsd_link');
        remove_action('wp_head', 'wlwmanifest_link');
    }
    add_action('init', 'removeHeadLinks');
    remove_action('wp_head', 'wp_generator');

    if (function_exists('register_sidebar')) {
        register_sidebar(array(
            'name' => 'Sidebar Widgets',
            'id'   => 'sidebar-widgets',
            'description'   => 'These are widgets for the sidebar.',
            'before_widget' => '<div id="%1$s" class="widget %2$s">',
            'after_widget'  => '</div>',
            'before_title'  => '<h2>',
            'after_title'   => '</h2>'
        ));
    }

?>