Stop everyone from editing a form they shouldnt be allowed to edit

[BigJohnny]

In my NEWTHREAD/EDITPOST templates i have a form called by $inputform, and the info entered into this form is displayed on SHOWTHREAD by using $showform

Now my problem here is that although they are both called the same way, only $showform seems to work properly in that it only shows in forums that it has been enabled/allowed to show in.

$inputform also shows properly, by only showing in the forums it has been enabled in, HOWEVER, after the thread starter has created the thread, and someone makes a reply, if any person who made a reply to that thread edits their reply, they are also able to edit the information that only the thread starter should be able to edit, and only in the 1st post of a thread.

This form should not be showing up at all for reply edits period. Doesnt matter who the user is and who is editing a reply, this form should simply not show up unless the thread starter is editing 1st post.

How can i stop this from happening, and it would be preferable not to surround $inputform with any form of code or conditionals.

since i am modifying a hack that was already created, and it did work before, i dont know why it all of a sudden started doing this.
This is especially weird since i have done nothing as far as actual PHP/plugins etc are concerned.

I have only been playing with the templates up to this point and just changing how the forms actually look.

Thanks in advance for any helpyou guys can give me