Please Help !, camera rotation

i want to rotate camera when i click a button.

var soundHover : AudioClip;
var soundEnter : AudioClip;


function OnMouseEnter(){
	renderer.material.color = Color.gray;
	animation.Play("MouseOver");
	audio.PlayOneShot(soundHover);
}

function OnMouseExit(){
	renderer.material.color = Color.white;
	animation.Play("MouseExit");
}

function OnMouseDown(){


	//here, if this function active, camera rotate

	renderer.material.color = Color.grey;
	audio.PlayOneShot(soundEnter);
}

@script RequireComponent(AudioSource)

NB : sorry for my bad english, i’am indonesian.

If you read the docs:

you’ll learn how to perform rotation.