I wrote a simple plugin that before now only had one option so the code below calling wp_nonce_field worked fine. However, now that I've had a second option it seems that the code below only allows updating of the most recent field. I unfortunately have to admit that I do not fully understand what the wp_nonce_field code is doing and I'd love someone to explain it to me. The code I am using came from here I know it's most likely something super simple.
$cookie_hours = (get_option('mobileesp_wp_cookie_hours') =="") ? "24" : get_option('mobileesp_wp_cookie_hours');
echo '
<div class="wrap">
<h2>MobileESP for WordPress Settings</h2>
<p>This WordPress plugin will detect mobile devices and redirect the user. For this plugin to work you must first enter the redirect url below.
You must also create a mobile site or have content at that location. </p>
<form method="post" action="options.php">
'.wp_nonce_field('update-options').'
<table class="form-table">
<tr valign="top">
<th scope="row"><label for="mobileesp_wp_target_url">Where do we send mobile devices?</label></th>
<td><input type="text" name="mobileesp_wp_target_url" id="mobileesp_wp_target_url" value="'.get_option('mobileesp_wp_target_url').'" class="regular-text code" /></td>
</tr>
<tr valign="top">
<th scope="row"><label for="mobileesp_wp_cookie_hours">How many hours should the cookie be valid?</label></th>
<td><input type="text" name="mobileesp_wp_cookie_hours" id="mobileesp_wp_cookie_hours" value="'.$cookie_hours.'" class="regular-text code" /></td>
</tr>
</table>
<input type="hidden" name="action" value="update" />
<input type="hidden" name="page_options" value="mobileesp_wp_target_url" />
<input type="hidden" name="page_options" value="mobileesp_wp_cookie_hours" />
<p class="submit"><input type="submit" name="Submit" value="Submit" class="button-primary" /></p>
</form>
Here is the full source of the most recent version (with only one option) http://plugins.svn.wordpress.org/mobileesp-for-wordpress/trunk/mobileesp_wp.php
