Screen saver do not display at 15seconds

hi everyone.
I need to set a screen saver to start at 15seconds in macOS X (10.5). This needs to be configured in a particular way since the screen saver is in an secondary account with no admin privileges and parental control turned on.
Basically in this account the user can only access the internet (through Safari).
Now, i've already defined the command "defaults -currentHost write com.apple.screensaver idleTime 15" (in the terminal of the administrative account)and it's works fine. But when i log into the account with limited privileges and run the same script the screen saver only displays after three minutes of inactivity.
Any ideas?
thanks

Try using 'su' instead of actually logging into the other account (if you're not already doing that).
In Terminal, while in your admin account, type 'su <15secAcct>' - of course without the quotes and with <15secAcct> replaced by the name of the account whose screensaver time you want to change. It'll ask you for the password for that account.
Then, enter your defaults command to set the screensaver. Type 'exit' to leave that user account and return to your own; then, 'exit' again to get out of Terminal. (Again, maybe you know this, but just in case...)
That should work for you.

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