In Blender internal render the Textures tab has checkboxes that can be keyframed. This means you can change textures by unchecking and checking. An example would be if you had 3 different textures with eyes (1 is open, 2 is half open, 3 is closed) and you key them to simulate the texture animation.
Is there a similar way to do that in Cycles Render, because those boxes don't appear.