Billy has given you some good links there.

I did an internet search and did come up with some sites that may be useful although they are not scripts exclusively you may find resources on them. You may have some of these already but they could be useful to other folks who stumble across this thread.
http://www.childrenssafetynetwork.org/ : This one looks pretty in depth.
http://www.safetykids.org/ : This one has some songs about safety. I would ask them before you actually used them though. Actually some of them seem to be old standard melodies with new lyrics.
http://www.cdc.gov/family/kidautumngames/ : This page has some games on it that may inspire some ideas.