variable from another script doesn't update

hi,

i'm working on a project with kinect for windows and unity and i've got a problem:

i use two scripts (SitToStand and test) and test uses a variable of SitToStand

 void Start()
     {
         gameObject.GetComponent<SpriteRenderer>().sprite = sit;
         showSit = GameObject.Find("SitToStand").GetComponent<SitToStand>().showIcon;
     }

and

 void Update()
     {
         showSit = GameObject.Find("SitToStand").GetComponent<SitToStand>().showIcon;
         //print(showSit);
         if (showSit==true)
         {
             gameObject.GetComponent<SpriteRenderer>().sprite = sit;
             return;
         }
         else
         {
             gameObject.GetComponent<SpriteRenderer>().sprite = stand;
             return;
         }
     }

in SitToStand, the showIcon variable is set to true in Start() and to false in Update()

but when running in unity, showSit never changes, it's always true. any idea?

thanks