[users@httpd] Virtual Hosts help needed?

[Mehmet Fatih AKBULUT <mfatihakbulut@xxxxxxxxx>]

hi all,
i am a newbie on such subjects :)
but i want to ask something to you:

NameVirtualHost *:80

<VirtualHost *:80>
ServerName debian
ServerAlias localhost
DocumentRoot /var/www/
</VirtualHost>

<VirtualHost *:80>
ServerName debian1
ServerAlias localhost1
DocumentRoot /var/wwwwww/
</VirtualHost>

these are my virtual host definitions and all i want to do is this :

i have two folders under /var/ which are /www and /wwwwww
and i want apache to show files under /www when 'http://localhost' is typed on browser.
and to show files under /wwwwww when 'http://localhost1' is typed on browser.

for 'http://localhost' everything is ok. but when i type 'http://localhost1' get the error below :

An error occurred while loading 
http://localhost1/
Unknown host localhost1 ...

how i can achieve ?