I thought I'd add this as I'm weary on low level captcha plugins and like replacing it with reCaptcha...

First of all, disable the built-in captcha for PhocaGuestbook:

1. Components > Phoca Guestbook
2. Select "Items" and click on the "Parameters" icon in the top right
3. Scroll down to "Enable Captcha" and set this to "NO"

Time for some hard-coding:

At about line 287 in the file /components/com_phocaguestbook/views/phocaguestbook/tmpl/default.php you should find the following code:

 
	<tr>
		<td> </td>
		<td colspan="3"><input type="submit" name="save" value="<?php echo JText::_('Submit'); ?>" />  <input type="reset" name="reset" value="<?php echo JText::_('Reset'); ?>" /></td>
	</tr>
</table>

Replace this with:

 
	<tr>
		<td> </td>
		<td colspan="3">
		<?php
			global $mainframe;
			$mainframe->triggerEvent('onCaptchaDisplay');
		?>
		</td>
	</tr>
	<tr>
		<td> </td>
		<td colspan="3"><input type="submit" name="save" value="<?php echo JText::_('Submit'); ?>" />  <input type="reset" name="reset" value="<?php echo JText::_('Reset'); ?>" /></td>
	</tr>
</table>

HEY! It's not over yet.

I found that this change causes a silent JavaScript error (as in some browsers will just process the form normally but this needs to be fixed anyway). At about line 11:

 
var text = tinyMCE.getContent();

Comment this out and insert or replace with:

 
var text = form.pgbcontent.value;

Works for me...

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