Using two login forms to secure two groups or urls

[dafe52]

I've been trying for weeks to do this:

I have two groups of URLs in my application and I want to redirect to two different login forms depending on the group I come from ... It's the typical case of the public login form (users of the application) and administration form (the administrators) ...

I read all the examples and google a lot, but I've not found a clear way to do this. Some suggestions or a little example or indication is much appreciatted.
Thank you in advance

[dafe52]

Any indication is much appreciated...

There are two patterns of URLs, and when security fails in one, I want to go to a login form, and when fails in another type of URLs, i want to go to different login form...