simple yet complex

[ray2830]

ok. here's the question.

i'm hosting 2 sites on my web account.

the 2nd site is on a subdirectory of the root like:
/public_html/2ndsite

is there a way to deny access to scripts executed in
/public_html/2ndsite
or below to all files in /public_html?

this way if
/public_html/2ndsite gets hacked, they can't delete files in
/public_html/1stsite

thanks