Plugin: Hidden Input
Author: Mark Wu
Release Date: 2005/03/13
Version: 1.0

This plugin offers you add hidden fields to your comment form to prevent comment spam robot. Usage as followed:

You can use:
1. $hiddeninput->isEnabled() to check the plugin is enabled or not. 
2. $hiddeninput->getHiddenFields() to get the hidden fields. 

Example:
Add the following code to commentform.template inside <form> ... </form>:
{if !empty($hiddeninput)}
{if $hiddeninput->isEnabled()}
{foreach from=$hiddeninput->getHiddenFields() item=hiddenField}
<input type="hidden" name="{$hiddenField}" value="GetOut!" />
{/foreach}
{/if}
{/if}