Can't set start Transform?

Why isn't it possible to set the start Transform of a object as a variable?

Take this script for example:

Code (csharp):

1.  
2. private var yStart = transform.position.y;
3.  
4. function Update () {
5. print (yStart);
6. }
7.  
8.  

For it Unity gives me nothing but trouble:

"System.NullReferenceExeption: Object reference not set up to an instance of an object"!

I guess I could manually set the start position of the object, but Im lazy!

 

There you go, If Unity had updated the script in my obj after I tried placing transform inside a Start function, I would have known better than to post this post.

And If I could now delete the unnessecary post I could awoid looking like a spammer and keep some of my reputation intact. Arrhg! :cry: