Help with PHP Anti spam (in SimplePHP Blog)

I'm using the script SimplePHP Blog I've had some problems but I thought they were through... they weren't. so here is the latest problem. The antispam picture showing numbers that you are supposed to enter doesn't show when trying to comment a post...

So here are the sources for the malfunctioning page(s) (I don't know where the problem really is, but I do know that the system works, because it does on the contact me page)

So I Zipped the files. The comment ones are the ones who arent working and the contact ones are working...

I really appreciate anyone taking time just to read this thread

Thanks
Jez