Apache: limiting the execution place

["Nebi Gurbanov" <nebi () itu edu tr>]

Greetings,
I want to know your opinions for the case below; 

I have severel users whose home directories lay in /home directory . 
Each user has a public_html directory in his/her home directory ,like ;
/home/user_name/public_html
Permissions of directories "user_name" and "public_html" must be at
least 701 , so that web pages can be viewed . 
But there is another case , any of the users can "cd" to parent
directory (/home in this case) , and then to "another_usersname"
directory (which is home directory of any other user), and then to
public_html and can view all the readable file in public_html (even in
"another_usersname" directory). It can also be done via php and cgi
(Ok,I know setting  "safe mode on" in php will prevent it, but I want a
global solution). 

        What I want to do is preventing one user from getting into
another user's home directory and reading his/her files . 
        Has anybody ever made a design that does the thing  I want to
have !?


Thanx ..
        



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