Pre made sentences in a section

[Muazam]

Hello everyone.

I'm using the [HIDE] tag, where you have to reply to the post before you see the content.
Only in one section, that section is getting spammed. with "RNJSDFHSJK", "ASfnsds", "dsadsad", etc. You get my point.

I want to have pre-sentences, so when someone post, their post "asadsdsf" changes to something like: "Thanks a lot!".

I can basic PHP. Where do I script it in?

Thanks!;)