A non user when clicks on the attachment link goes to a blank page

[ujwaltrivedi]

A non user when clicks on the attachment link in the below link goes to a blank page. I have permission settings that Non Registered users cannot download attachments. But what I want is it should go to the Login Page. How can i do that?

http://forums.aviationquestions.com/forum/main-category/forum-rules-regulations/26-how-to-edit-your-signature


Thanks,
Ujwal