"Settings Updated" message Stopped showing - php

Question

I was using the code below as a Plugin to create a "Options Menu Page" for wordpress:
add_action('admin_init', 'cardin_options_init' );
add_action('admin_menu', 'cardin_options_add_page');
function cardin_options_init(){
register_setting( 'cardin_options_options', 'cardin_options');
}
function cardin_options_add_page() {
add_options_page('Cardin Options', 'Cardin Options', 'manage_options', 'cardin_options', 'cardin_options_do_page');
}
function cardin_options_do_page() {
?>
<div class="wrap">
<div id="icon-options-general" class="icon32"><br></div>
<h2>Cardin Options</h2>
<form method="post" action="options.php">
<?php settings_fields('cardin_options_options'); ?>
<?php $options = get_option('cardin_options'); ?>
<table class="form-table">
<tr valign="top"><th scope="row">Information</th>
<td><input type="text" name="cardin_options[information]" value="<?php echo $options['information']; ?>" /></td>
</tr>
</table>
<input type="submit" class="button-primary" name="submit" value="<?php _e('Save Changes') ?>" />
</form>
</div>
<?php
}
It's working how it should, but, later I decided to create my Own Plugin Menu Page, not a 'Settings' sub-menu, then, I changed the line below:
add_options_page('Cardin Options', 'Cardin Options', 'manage_options', 'cardin_options', 'cardin_options_do_page');
to:
add_menu_page('Cardin Options', 'Cardin Options', 'manage_options', 'cardin_options', 'cardin_options_do_page');
It worked, but when i click "Save Changes" the "Settings Updated" message doesn't display anymore. What should I do to make it display again?
Thanks alot in advance and sorry for the bad english.

Answer 1

<?php if($_POST['oscimp_hidden'] == 'Y') { ?>
<div id="message" class="updated">
<p><strong><?php _e('Settings saved.') ?></strong></p>
</div>
edit:
heres a guide: http://net.tutsplus.com/tutorials/wordpress/creating-a-custom-wordpress-plugin-from-scratch/
search for: if($_POST['oscimp_hidden'] == 'Y') {