is not familiar js code to me. From what I see the script should end at the semicolon.
I'm also not sure that placing this code in the body of the page is a good idea -- either pacing it in the head or calling it from an external file leaves less room for problems.
I always use the comment marks, even in the head. The little bit of file size that might be saved isn't worth it. There's lots of browsers out there besides NN and MSIE -- you can't test on them all, so it's best to stay with the best practice standard.