Simple menu problem

Hi, I made a basic menu script using C# but I'm having an odd issue, For some reason putting a mouse over one option will color all of them.

 public class HoverOver : MonoBehaviour 
 {
     public string LevelToLoad;
     public GameObject gameObject;
     public bool isQuit;
 
     void OnMouseOver() 
     {
         gameObject.guiText.font.material.color = Color.magenta;
     }
 
     void OnMouseExit() 
     {
         gameObject.guiText.font.material.color = Color.white;
     }
 
     void OnMouseDown() 
     {
         Application.LoadLevel(LevelToLoad);
 
         if (isQuit)
         {
             Application.Quit();
         }
     }
 }