Can't script multiple animations on the player?

C#

Hi there. I have a problem with my player animations. My player is a tank, with animations setup in the FBX such as "forward, backward, rotate" I cannot seem to use more than 1 animation in my C# script. When I type exactly this:

          if (Input.GetAxis("Vertical") > 0.1)
 
    animation.CrossFade ("tank_anim_forward");
         
          if (Input.GetAxis("Vertical") < 0.1)
    animation.CrossFade ("tank_anim_idle");
         
         
         
          if (Input.GetAxis("Vertical") < 0)
    animation.CrossFade ("tank_anim_backward");
         
          if (Input.GetAxis("Vertical") > -1)
    animation.CrossFade ("tank_anim_idle");

Only the tank_anim_forward animation will play. The tank_anim_backward never plays. Even worse, the forward animation does not work properly when there are more than 1 coded animations.

When I delete the backward animation code, the forward animation works perfectly. I have tried multiple things to solve this, but I cannot seem to fix this.

 if(Input.GetKey("w")
 {
    animation.Play("tank_anim_forward")
 }

The above code type has the exact same result. Worst thing is, there are NO errors or warnings...

I am using Unity version 4.2.1f4
Thanks in advance.