Reset highScore in Java problem

Hi All,

I'm looking for a way to reset my high score.

I have a button on my main manu screen that should allaw to reset the high score.

The vars for this are: var highScore3DText : TextMesh; //The score text button var resetScoreButton : resetScore; //The reset text button

The highScore line is: function Awake() { highScore3DText.text = "High Score:" +PlayerPrefs.GetInt("highScore").ToString(); }

The function for the reset button is: function Update() { if(Input.GetMouseButtonDown(0))
{ ray = Camera.main.ScreenPointToRay(Input.mousePosition);

 if(Physics.Raycast (ray, rayCastHit)) 

{ if (rayCastHit.transform.name == "playButton")

 Application.LoadLevel("mainGame");                           //Load first level button    

{ if (rayCastHit.transform.name == "resetScoreButton") //Press button to reset high score.

 ??????? = 0;   //what should I use here? resetScore is not working.

}}}}

Is using var resetScore correct? I can't find any info on this. Please help.

Cheers