change captcha on login and register pages - repost

Hi. Need this right now. I am having a problem with my existing captcha not working with google chrome. So I have decided to change it to a new style captcha. Need you to remove old captcha code and implement code for the new version (areyouahuman) This needs to be implemented in 3 places, once the first is working it will be a simple copy and paste to the other 2 places. I have all the code you need and it has been configured for the website already, so a nice quick job.