Customer Portal Questions

Customer Portal Questions

Look and Feel:
We want to be able to change the colors of the portal.  How can we do this to make it more seamless with our other applications?

User Authentication:
Can we enable users signed in our content management based site to access the portal by being signed in seamlessly through an integration with any of the published API's?  I have not looked through them all yet, but was wondering anyone can comment on that.

Thanks