Can't assign camera to variable.

I have three cameras in my scene. One follows the body of the tank, one follows the turret of the tank (rotation), and eventually, i want one that is a "zoomed-in" view. However, when I go to drag my cameras into the "camera1""camera2" variable slots in the inspector, I just simply cant. No errors or anything, it's just physically impossible to drag it onto the slot.

Here's a screenshot. You can see my code, and variables on the right, and my cameras on the left.

Here's the code I'm using, and I've seen it a hundred times.

var camera1 : Camera; var camera2 : Camera;

function Start () { camera1.enabled = true; camera2.enabled = false; }

function Update () { if (Input.GetKeyDown ("2")){ camera1.enabled = false; camera2.enabled = true; } if (Input.GetKeyDown ("1")){ camera1.enabled = true; camera2.enabled = false; }
}