creating the '.htaccess' file with the text 'Options +Indexes'
thats half the battle
im not sure of your situations on control panels:
*in plesk its just a check mark apon domain creation
*webmin (webmin.com) is under the gpl and a great control panel software that may help configure this in the servers -> apache -> 'prolly going to the botom and select the virtual server'
*you might also try webmin w/ virtual-min for kicks and just creat a virtual server there
good luck and contact me if you need help
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