Using GUI slider to control animation on object

Well, just take the example from the GUI slider reference and from Animation.Sample and you're done.

private var hSliderValue : float = 0.0;
private var myAnimation : AnimationState;
 
function Start(){
    myAnimation = animation["MyClip"];
}
 
function LateUpdate() {
    myAnimation.time = hSliderValue;
    myAnimation.enabled = true;
 
    animation.Sample();
    myAnimation.enabled = false;
}
 
function OnGUI() {
    hSliderValue = GUILayout.HorizontalSlider (hSliderValue, 0.0, myAnimation.length,GUILayout.Width(100.0f));
}

출처 : http://answers.unity3d.com/questions/59406/using-gui-slider-to-control-animation-on-object.html