Online Family works with Firefox but not Safari?

I just installed, configured, and tested Online Family with the Firefox browser on my Mac and it worked fine.  However, using the same login account, I found that when I use the Safari browser, nothing is blocked.  What must I do to get it working with Safari. 

 

Safari version 5.0.1

Firefox version 3.6.7

Mac OS X version 10.5.8

 

Thank you for your help