multiple personality disorder response

after reading the article about mulitiple personality disorder, i learned a lot about the disease. i always thought that multiple personality disorder meant that the person would be like jekyle and hyde, and would be two seperate personalities, but i learned (on the second page, bottom paragraph) that a person suffering from multiple personality disorder could have 13 to 15 diffrent personalities. multiple personality disorder is triggered usually from a tramatic event in childhood. after experiencing a tramatic event, the victim will most likely begin to have multiple personalities, probably to try to escape the reality that something terrible had happend to them. there is no cure for this disease, however therapy is very helpful in making it managable. i was woundering, is multiple personality disorder similiar to bipolar disorder? when i think of jekyle and hyde i think of two opposite people, and when i think of drastic change in behavior, which reminds me of bipolar disorder.