Aliases not working in Apache

["Mani" <m_subramani@xxxxxxxxxxx>]

Hi,
    I cant get Aliases working on My Apache..
I added the following to my httpd.conf

Alias /mani /usr/local/src

When i try to open this using my browser it says requested url not found.
The default Aliases are giving a You are not authorized  message.
Why is this occuring. I have even tried giving chmod 777 /usr/share/doc/ -R,
but still it gives unauthorized access.

Is there any other entry I should make for the Aliases to work.
Mani