WordPress -> Custom Widget Function. Add to functions.php.

wp-new_widget.php

<?php

    function create_widget($name, $id, $description)
    {
        register_sidebar(array(
            'name' => __( $name ),
            'id' => $id,
            'description' => __( $description ),
            'before_widget' => '<div id="'.$id.'" class="widget %1$s %2$s">',
            'after_widget' => '</div>',
            'before_title' => '<h3>',
            'after_title' => '</h3>'
        ));
    }

    create_widget("Header", "uptop", "Displays in the header of the site, above the title");
?>