Need help wiring off a 3 way switch

So I am trying to add a switch to another light. I added a 3 gang box, ran all the wiring but find myself getting stumbled at the switch area, having a mental block over this for some reason. The two switches are 3 way switches. Here is a not so good drawing I did. Attachment 37406 (http://www.doityourself.com/forum/attachments/electrical-ac-dc/37406-need-help-wiring-off-3-way-switch-studio.jpg) thank you in advance