Secure password login of admin folder

Hello all,

I'm using dolphin 6.0.0.4, I wanna to ask how to protect admin folder by htaccess password or secure login, I did it from the server it self and I protect the admin folder but when I load the index page of my website request the password from any visitor cos there is the spacer.gif placed in the admin folder! how can I edit the code and replace the spacer.gif location to another folder outside the admin folder..

thanx