thx Bunny83, but if you could heplp me more it would be great. I made this one:

public var dist:int = 2;
var player : GameObject;
var target : GameObject;
var animation1 : AnimationClip;
var sound1 : AudioClip;


function OnMouseDown () {
 if(Vector3.Distance(player.transform.position, transform.position) <= dist)

 audio.clip = sound1;
 audio.Play ();
 target.animation.clip = animation1;
 target.animation.Play ();
 }

function Update () {

}

and I puted FPS Controler onto it. and I achived that there is no Error apears, but still script doesn't work in a distance I put. what is wrong?

What doesn't work. Be more specific.
To sum up: Your script does play the given sound an play the given animation when you click on that object when it's within the range of 2 units. Is that what you want? if not, tell use what you want.

Also tell us what happens when you click the object. Does the sound play? nothing happens? the animation plays?

Note: the "target" object (the one with the animation) need this animation to be in the animations list, otherwise it can't be played.

Yes, everything works. Animation works, sound is playing, but not in the range of 2 units. From one side from the object I have to be like 1,5 unit from it, and from the other side I have to be very close, like I have to touch the object to make function OnMouseDown works. So it seems like whole script works exept the 'distance'part.

Or maybe the problem is not in the Vector3 but in the position of the FPS Controller, like here: http://answers.unity3d.com/questions/35083/transform-position-not-changing.html I'm useing FPSWalker.js from FPS Controller to move my Player. How can I check if coordinates of my Player are actualy changeing while I'm walkig around the map? and if they not, how can I make them changeing?

I just realised that you don't have any brackets after your if-statement. That way only the next line will be affected which is

audio.clip = sound1;

Everything else is always executed when you click. That's why you should indent your code properly. Also, if you don't use it, remove the Update function.

function OnMouseDown ()
{
    if(Vector3.Distance(GameObject.Find("Player").position, transform.position) <= dist)
    {   // You miss this one
        audio.clip = sound1;
        audio.Play ();
        target.animation.clip = animation1;
        target.animation.Play ();
    }   // and this one
}

the same Error apears. It might be a problem that I put 'GameObject' twice in one script, and these should be a diferent objects?