Need Help with Options page

I have the following code and when I try to set an option it does not work. does anyone have an idea why? I don’t get any errors, i just does not set the options.

if ( is_admin() ){ // admin actions
  add_action( 'admin_menu', 'add_mymenu' );
  add_action( 'admin_init', 'register_mysettings' );
} else {
  // non-admin enqueues, actions, and filters
}

function register_mysettings() {
$dropb_email = $_POST['dropb_email'];
$dropb_pass = $_POST['dropb_pass'];
$dropb_dest = $_POST['dropb_dest'];
$dropb_remotedir = $_POST['dropb_remotedir'];
  register_setting('dropbox-options', "$dropb_email" );
  register_setting('dropbox-options', "$dropb_pass" );
  register_setting('dropbox-options', "$dropb_dest" );
  register_setting('dropbox-options', "$dropb_remotedir" );
  echo '<div id="message" class="updated fade"><p>Settings Updated!</p></div>';
}

?>

<form method="post" action="">
<?php wp_nonce_field('update-options'); ?>
<?PHP settings_fields('dropbox-options'); ?>
<table class="form-table">
<tr valign="top">
<th scope="row">Email</th>
<td><input type="text" name="dropb_email" value="<?php echo get_option('dropb_email'); ?>" /></td>
</tr>
<tr valign="top">
<th scope="row">Password</th>
<td><input type="text" name="dropb_pass" value="<?php echo get_option('dropb_pass'); ?>" /></td>
</tr>
<tr valign="top">
<th scope="row">Destination</th>
<td><input type="text" name="dropb_dest" value="<?php echo get_option('dropb_dest'); ?>" /> <strong>This must be a public folder</strong></td>
</tr>
<tr valign="top">
<th scope="row"></th>
<td>Example: "public" would be the default public folder.</td>
</tr>
<th scope="row">Dropbox Account #</th>
<td><input type="text" name="dropb_remotedir" value="<?php echo get_option('dropb_remotedir'); ?>" /> <strong>Your dropbox unique number</strong></td>
</tr>
<tr valign="top">
<th scope="row"></th>
<td>Where do I find this?</td>
</tr>
<tr valign="top">
</table>
<input type="hidden" name="action" value="update" />
<input type="hidden" name="page_options" value="dropb_email,dropb_pass,dropb_dest,dropb_remotedir" />

<p class="submit">
<input type="submit" class="button-primary" value="<?php _e('Save Changes') ?>" />
</p>
</form>
</div>