Warning: Cannot modify header information

I tried the “How do I solve the Headers already sent warning problem?” but no luck.
Still get error on http://drdubrow.medave.net/wp-admin/
Here is the functions.php file within the theme:

<?php
define('FILES',get_bloginfo('template_url'));
?>

 <?php register_nav_menus(); ?>
<?php
    register_sidebar();
?>

<?php if ( function_exists('register_sidebar') ) {
register_sidebar(array(
'name' => 'Footer Sidebar',
'id' => 'footer-sidebar',
'description' => 'Appears as the sidebar on the custom homepage',
'before_widget' => '<div style="height: auto"></div><li id="%1$s" class="widget %2$s">',
'after_widget' => '',

'after_title' => '</h2>',
));
}

?>
<?php add_theme_support( 'post-thumbnails' );
?>

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Okay,
I am now able to get into the /wp-admin after modifying this file.
Too much code in here that was not needed.