Camera follow Character Script Problem

[system]

Hi im looking that the camera follor my character only in Y but in my stage my character is moving in X, Y and Z.

im using this code for do this but im having a problem with the camera position.

var dampTime : float = 0.3; //offset from the viewport center to fix damping
private var velocity = Vector3.zero;
var target : Transform;

function Update() {
    if(target) {
        var point : Vector3 = camera.WorldToViewportPoint(target.position);
        var delta : Vector3 = target.position - camera.ViewportToWorldPoint(Vector3(0.5, 0.5, point.z));
        var destination : Vector3 = transform.position + delta;
        transform.position = Vector3.SmoothDamp(transform.position, destination, velocity, dampTime);
    }
}

when i play my demo the camera started in other Y position.

My character is in Y 2.7 and my camera Y 5.5

I think that this code is transforming my Camera Y in the Character Y position.

any help? thanks!

[system]

instead 0.5 in y, put point.y