apache aliasing

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

i have an apache server w/ serveral aliases. however, i am trying 
to add a new alias that is confusing me:

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


<VirtualHost *:3011>
    DocumentRoot /var/www/oscommerce/catalog
</VirtualHost>


when i try to access http://server:3011/index.php i think i should 
get the index.php in /var/www/oscommerce but i just get a 500 error.
if i just try http://server:3011/ i cannot read the contents of 
the directory.

suggestions?