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.