mapping two files in same directory using Alias directive

Hi group!!
I have a problem configuring apache

i want to map to two diffrent files in the same directory according to
Alias provided
So if the the user types the url as http://zz.zz.zzz.zzz/tt
i must go to file first.html ie ie http://zz.zz.zzz.zzz/pp/first.html

and if the user types the url as http://zz.zz.zzz.zzz/pp
i must go to file second.html ie http://zz.zz.zzz.zzz/pp/second.html

what is happening in current situation is that whatever be the URL of
the above two i am directed to second.html

I assume that DirectoryIndex property is causing it but i am not sure
I havent touched httpd.conf file and all the default settings are
maintained so DocumentRoot has not been changed its still
/var/www/html


My query is
with above scenarion what am i supposed to do to my conf file in
/etc/conf.d/ so that everything works right ?

I have tried using Redirect permanent and it works fine but i dont
want to pass the absolute url which is the case in Redirect
like
Redirect permanent /tt http://localhost:9001/system/first.html
Redirect permanent /pp http://localhost:9001/system/second.html


Can mapping to two different files which are in the same directory can
be done using aliases?


Following is my conf file in /etc/conf.d/ direcory

Alias /tt "/home/site/"

<Directory "/home/site/">
DirectoryIndex first.html
Options Indexes MultiViews
AllowOverride None
Order allow,deny
Allow from all
</Directory>


Alias /pp "/home/site/"

<Directory "/home/site/">
DirectoryIndex second.html
Options Indexes MultiViews
AllowOverride None
Order allow,deny
Allow from all
</Directory>

thanks
in advance
Ramesh