animation help with falling when not grounded?

hey this is my code for my mesh within my character controler so that he animates can anyone help fixing it?

 #pragma strict
 
 function Start () {
 
 }
 
     function Update () {
    if (Input.GetAxis("Vertical") > 0.1 || Input.GetAxis("Vertical") <-0.1)
        animation.CrossFade ("walk");
    else
     animation.CrossFade ("idle");
     
     if (Input.GetAxis("Horizontal") > 0.1)
             animation.CrossFade("walkr");
         else if 
         (Input.GetAxis("Horizontal") < -0.1)
             animation.CrossFade("walkl");
 }

all i want is when the player isent touching the ground play the falling ('jump') animation, and when touching the ground play the walk/idle one. the script is in the mesh prefab thing within the fps controller