The difference between bipolar and schizophrenia is that bipolar person, even if she has psychosis it is always during her mood episodes, so the person can be delusional during mania but when the mood is normal the delusions are completely gone. Schizophrenic have delusions without the mood altered.
Besides, even when the bipolar person gets psychotic she gets mostly delusional but will not have hallucinations or voices - that is schizophrenic. That's what i think.
Btw, You can visit my blog which talks about life in the mental hospital,
Kuna
http://mentalhospitalinpoland.blogspot.com/