password protect folders in OS X

[Gerard Tripptree]

I have my iBook setup for automatic login when I turn it on however, I 
would like to password protect a number of individual folders on my iBook 
with their own passwords. I simply do not want unauthorized users to open 
the folders if the iBook is left unattended for a few minutes.

Is there an OS 10.2.4 compatible app that will enable this level of security?

Thank you.