windows live mail signatures

I have two e-mail accounts. One is Personal and the other is for the business. I created a signature for the business and it works great. I checked the e-mail account that the signature should go to and works. I also created one for the personal account, checked the personal account box. Now when I send new mail from the personal account it inserts the Business account signature. How do I get it to do the personal when sending from the personal and the business signature when sending from the business? Thank you in advance.