apache and php scripts

[Harland Christofferson <debian-user@zerocrossings.com>]

i am trying to get a .php script to run via apache. i have other 
cgi scripts running for other aliased paths but none for .php. 

i have installed the php4 package via apt-get.

my alias in http.conf for this script is:

#
# Alias for oscommerce added 08/02/04 by hhc
#

Alias /oscommerce/index.html /var/www/oscommerce/catalog/index.php
<Directory /var/www/oscommerce/catalog/index.php>
  Options ExecCGI Includes FollowSymlinks
  AddHandler cgi-script .php .cgi .sh .pl
</Directory>


and i can get to the target directory. however, the contents of the 
directory are displayed in the browser. also, when i click on a .
php file, i am prompted to download the file. 

in the apache error log, the line:

[notice] suEXEC mechanism enabled (wrapper: /usr/lib/apache/suexec)

is logged which i have read is a good thing.

does anyone have suggestions as to what i am doing incorrectly?