Style Options

Hello, I am working on creating a custom style options page for my WordPress style, I have a problem, when say I press submit to update a value, it reloads the page, it says uupdated etc, but nothing changes, until user refreshed page, then it will update, my code:

<?php

function setup_theme_admin_menus() {
    add_menu_page('Open Theme | Options', 'Open theme', 'manage_options',
        'open_theme_settings', 'theme_settings_page');

    add_submenu_page('open_theme_settings',
        'Open Theme | Front Page', 'Front Page', 'manage_options',
        'front-page-elements', 'theme_front_page_settings');
}

// We also need to add the handler function for the top level menu
function theme_settings_page() {
$open_width = get_option("open_width");
?>
<div class="wrap">
<?php screen_icon('themes'); ?> <h2>Open Theme Options</h2>
<?php $posts = get_posts(); ?>

<form method="POST" action="">
            <table class="form-table">
                <tr valign="top">
                    <th scope="row">
                        <label for="num_elements">
                            Page Width:
                        </label>
                    </th>
                    <td>
                        <input type="text" name="open_width" value="<?php echo $open_width;?>" size="5" />
                    </td>
                </tr>
            </table>
				<p>
					<input type="submit" value="Save Settings" class="button">
					<input type="hidden" name="update_settings" value="Y" />
				</p>
        </form>
</div>
<?php

	if(isset($_POST['update_settings'])) {
		$open_width = esc_attr($_POST['open_width']);
		update_option("open_width", $open_width);
		$open_width = get_option("open_width");
		?>
		<div id="message" class="updated">Settings saved</div>
		<?php
	}
}
function theme_front_page_settings() {
?>
<div class="wrap">
<?php
    echo "<h2>Open Theme Front Page</h2>";
?>
</div>
<?php
}

add_action("admin_menu", "setup_theme_admin_menus");