Apply ZombieWalk animation : Unity3d

Hello Everyone…

I am learning unity and i just wanted to know about how we can apply zombie walk animation through script?
I am having zombie 3d model with no animation. I want to know that is it possible to animate thoes 3d model by using script. ??

Because i have tried to animate them with 3ds max software but i failed to apply animation on that 3d model. because it requires more practice.

So is there any other way to make my zombie walk.?

I have tried zombie available on Mixamo : http://www.mixamo.com/catalog/motions/FREE-creeping-zombie-walk-loop-walking-86

But i want other types of zombie . even i don’t want to purchase.

Thanks to all of you for supporting me and helping me till now…

Hope for the best solution…

Watch this to understand the Mecanim animator controller in Unity and how to set properties of those animations through script: http://video.unity3d.com/video/7362044/