Shell script & good way to prevent accidental Unix " rm -r * " : Linux & HP-UX

Can anyone provide a Shell script such that if

a) if the person issues "rm -r *", the script will check if the current directory
    is / or /var or /usr or /oracle (or any additional directories that I may add
    from time to time),  it will not echo out a message, you are about to execute
    a dangerous delete from `pwd` & then come back to command prompt

b) if the person issues "rm *" or "rm *.*", it will do a confirmation, whether
    to proceed besides echoing "Alert, you're in `pwd`, confirm to proceed? "


Any other way to prevent accidental deletion of files are welcome.

I'm concerned that if I replace the "rm" binary with the above "rm" script,
certain cron or jobs may fail