can't offset normal map

the offset of the normal map seems to be linked to the main texture, is normal map offset a pro only feature? or am I missing something here?

this is my code:

#pragma strict
//javascript

var Offset : Vector2;
var Speed : float = 0.1;

function Update () {
Offset = renderer.material.GetTextureOffset("_BumpMap");
Offset.y += Speed;
renderer.material.SetTextureOffset("_BumpMap", Offset);
}

I’ve tried changing it in the inspecor but that doesnt work either

На братан)

#pragma strict
//javascript

var Offset : Vector2;
var Speed : float = 0.1;

function Update () {
Offset = GetComponent.().material.GetTextureOffset(“_BumpMap”);
Offset.x += Speed;
GetComponent.().material.SetTextureOffset(“_BumpMap”, Offset);
}