[X4U] Applescript gurus- auto-invoke screen lock?

[Michael Elliott]

I currently have my computer set to boot directly into the kids'  
accounts so that, in the event of a "hard crash" or hard-restart,  
that they still have easy access to their applications without going  
through a login procedure, etc.

However, I have EyeTV running on my account, which allows me to  
record TV shows like a digital video recorder, and if my account  
isn't logged in, it won't run. Invariably, my iMac will have locked  
up or crashed and have been re-booted on the day of a particularly  
interesting program I want to watch.

I know that setting the Accounts portion of System Preferences to  
auto login to MY account would fix the problem, but I don't want to  
expose my account to any risk of file deletion, etc by my kids.  They  
ARE capable of clicking on their own login item and getting into  
their own accounts from the login screen.

Is there an applescript that I can use in my login items that will  
invoke the screen saver/screen lock immediately upon login, so that  
my startup/login items are launched as expected, but there is no  
access to my account?

Thanks!

Michael