(a) Character evidence generally. Evidence of a person's character
or a trait of character is not admissible for the purpose of proving
action in conformity therewith on a particular occasion, except evidence
of the character of a witness, as provided in Secs. 18.607, 18.608, and
18.609.
(b) Other crimes, wrongs, or acts. Evidence of other crimes, wrongs,
or acts is not admissible to prove the character of a person in order to
show action in conformity therewith. It may, however, be admissible for
other purposes, such as proof of motive, opportunity, intent,
preparation, plan, knowledge, identity, or absence of mistake or
accident.