resetting the my default value for camera field of view

hello i have made a minimap for my game and ive got a vertical scroller so you can zoom in and out i was wondering how i would go about making a button that resets the camera.fieldofview and also resets the vertical slider this is probley easy but i am a noob and have tried everything i know. here is my code so far:

var             fovMax : float = 180;

var             fovMin : float = 1;

var             sliderPos : Rect = Rect ( 10, 10, 300, 30 );            

private var     camFOV : float;

function Start () {

    camFOV = camera.fieldOfView;

}

function OnGUI () {

    camFOV = GUI.VerticalSlider( sliderPos, camFOV, fovMin, fovMax );

    if(GUI.RepeatButton(Rect(Screen.width/2 -19 , Screen.height -50, 18, 18), "+")){

        camera.fieldOfView = 21f;

    }

}

function Update () {

    if (!Mathf.Approximately (camFOV, camera.fieldOfView)) camera.fieldOfView = camFOV;

any help will be appreciated thankyou.

its acutally really easy, since you have the camFOV var, just go

if(GUI.Button(Rect(10, 10, 200, 25), "Reset"))
     camera.main.feildOfView = camFOV;