Right, I understand that. I've specified the API login URLs in the functions_member_API.asp file:
Const strMemberAPILoginURL = "URL-for-loginpage.asp"
Const strMemberAPIRegistrationURL = "URL-for-registration.asp"
Const strMemberAPILogoutURL = "URL-for-logout.asp"
If someone clicks on "Login" option on any of the forum pages, they are properly redirected to the URL specified above. But when someone clicks on "Reply" they are not taken to the login page specified in the first variable above, but rather the forum login.