Adding reCAPTCHA to Contact Us Form

I just installed captcha to the contact us page on my website using the contact us addon, Contact reCAPTCHA - Version: 1.3.1.
It works if you click on the "Show all content" button but I don't want to have that message pop up when someone wants to us that form. I'm on version 1.3.9 and the documentation said it was designed for version 1.3.8a.
My client was getting daily spam messages so I needed to add it in.
Any help would be appreciated.

@Bgoat
I don't think you are using the same module that is discussed in this thread. This is for using the reCaptcha service on several different pages including the contact us form. My mod is up to date with 1.5.

Hello fellow Zen Cart users, I'm having a bit of a problem. I'm getting a error message in admin area. the message says Output has already been sent to the browser at /home2/quality3/public_html/admin-1336338685/includes/functions/extra_functions/recaptcha_functions.php:124. Please make sure the command $xajax->processRequest() is placed before this. I'm not sure what the problem is, but when I remove this folder the error goes away. Hope someone can help guide me in the right direction. Thanks

@GodfatherAntiques
Try downloading the install from my latest revision:
https://bitbucket.org/pickupman/zencart-recaptcha/get/tip.zip

There was line return issues between Windows/Linux line endings in the file you mentioned.

I downloaded and installed your latest plugin and I'm not getting any more errors on the admin side, but now on the contact us page it says Security Check: To use reCAPTCHA you must get an API key from http://recaptcha.net/api/getkey went to that site and page is not found. Not sure what the problem is. Also I'm not seeing under the configuration panel in admin a tab of the recaptcha. I've installed this add on before so I know this works. I need this add on because my host said I got a spam bot so they restricted access to site until this is installed. Hope you can help. Thanks

GodfatherAntiques:

I downloaded and installed your latest plugin and I'm not getting any more errors on the admin side, but now on the contact us page it says Security Check: To use reCAPTCHA you must get an API key from http://recaptcha.net/api/getkey went to that site and page is not found. Not sure what the problem is. Also I'm not seeing under the configuration panel in admin a tab of the recaptcha. I've installed this add on before so I know this works. I need this add on because my host said I got a spam bot so they restricted access to site until this is installed. Hope you can help. Thanks

Google now handles the API signup. The url used to redirect, but here it is anyways:
http://www.google.com/recaptcha/whyrecaptcha