Theme options fields won't save

Im making my very first theme, and i’ve come to the part where i want to create theme-options.

To start with i will just create a custom footer text, I’ve followed some tutorials, and i have everything nailed down, but the saving part. It doesn’t seem to save my option.

Here is my code from functions.php

function setup_theme_admin_menus() {
    add_submenu_page( 'themes.php', 'Theme Options', 'Theme Options', 'manage_options', 'theme-options', 'theme_options_settings' );
	}
	function theme_options_settings() {
		// Check that the user is allowed to update options
if (!current_user_can('manage_options')) {
    wp_die('You don't have access to this page.');
}
		?>
        <div class="wrap">
        <?php screen_icon(); ?><h2> Theme Settings </h2>
        <form method="POST" action="">
            <table class="form-table">
                <tr valign="top">
                    <th scope="row">
					<label for="footer_text"> Footer Text: </label>
                    </th>
                    <td>
        			<input type="text" name="footer_text" value="<?php echo $footer_text;?>" size="25" />
                    </td>
                  	</tr>
                    </table>
                    <p>
    <input type="submit" value="Save Settings" class="button-primary"/>
</p>
<input type="hidden" name="update_settings" value="Y" />
                    </form>
                    </div>
		<?php
		if (isset($_POST["update_settings"])) {
    	$footer_text = esc_attr($_POST["footer_text"]);
update_option("theme_name_footer_text", $footer_text);
?>
    <div id="message" class="updated">Settings saved</div>
<?php
}
}
add_action("admin_menu", "setup_theme_admin_menus");

And this is the code from my footer.php

<footer>
      <?php $footer_text = get_option("theme_name_footer_text"); ?>

        <p><?php echo $footer_text ?></p>
      </footer>

Another thing is, i can’t seem to get the icon to show in front of the title. I used the screen_icon(); function.

Hope you can help me