A couple wordpress questions for you.

Hey all,

Got two questions for ya.

1. I need/want to make it so when a user posts a photo to his blog it shows up simliar to this http://dirtywhitegi.blogspot.com/2009/09/beach-life.html
So it shows up as a thumbnail on the post but then you can click the pic and it shows the fullsize version.
Is there a plugin to do this?

2. Is there a way to "lock" the sidebar? Or atleast certain widgets of it? For exmaple, I want to put a Adsense box, recent posts, and recent comments on the sidebar of all user blogs and I do not want them to be able to change this. I dont mind if they add widgets below these 3, but I want these three to put at the top.
Is there a way to do this?

Thanks for the help!