problem with a spawner script

Code (CSharp):

1. (var i=0; i<amount; i++){
2. var spawnPoints : Transform[];  // Array of spawn points to be used.
3. var Prefabs : GameObject[]; // Array of different Enemies that are used.
4. var amount = 20;  // Total number of enemies to spawn.
5. var yieldTimeMin = 2;  // Minimum amount of time before spawning enemies randomly.
6. var yieldTimeMax = 5;  // Don't exceed this amount of time between spawning enemies randomly.
7. function Start(){
8.     Spawn();
9. }
10. function Spawn(){
11.    for (i=0; i<amount; i++){
12.       yield WaitForSeconds(Random.Range(yieldTimeMin, yieldTimeMax));
13.       var obj : GameObject = Prefabs[Random.Range(0, Prefabs.length)];
14.       var pos: Transform = spawnPoints[Random.Range(0, spawnPoints.length)];
15.       Instantiate(obj, pos.position, pos.rotation);
16.     }
17. }  

the problem say

assets/dropspawner.js(13,9): BCE0005: Unknown identifier: 'i'.

 

I'm missing a curly bracket.
Is ist true? You want to start the Start-function in a loop?

 

Line 1, copy paste mistake ?
I think even in Unity-Javascript you can't do loops outside a function ?