[NEED HELP] Hide post option

I would like to add an option that is on every post that is for moderators and admins ONLY, the option should be where all the other post options are: "Report , Hide, Delete, Edit, Quote", and when used would "hide" the post from regular users, and guests. When someone who isn't an admin or mod would view the post it would say "[This post has been hidden]", but when a mod or admin would view it, it would have the post's contents, and at the end it would say "[Hidden by (mod/admin's name that hid the post]". The reason I have this strange need you may ask? Because I want my moderators to hide the post rather than delete it, this is so administrators could actually see why the post was offensive. If the post was deleted, then admins could not conclude if the moderator was telling the truth or not, and the admins couldn't see how offensive the post was. BTW im very unfamiliar with PHP :s