"Press [e] to open" on stationary object when onTrigger

I want a text to be shown on a gameobject I'm triggering but leave the text on the stationary object.

I now have a GUItext which is being set on a X and Y position via the WorldToScreenPoint. But this moves along with my camera, and I want it to be on the top right of the gameObject. How would I manage this?

 public function setText(text, x, y) {
     if (!this.talkTriggerIsOpen) {
         this.talkTriggerIsOpen = true;
         var go : GameObject = new GameObject("TriggerText");
         go.AddComponent("GUIText");
         go.guiText.color = new Color(1.0f, 1.0f, 1.0f);

         go.guiText.text = text;
         var camera = GameObject.Find("MainCamera").camera;
         var screenPos : Vector3 = camera.WorldToScreenPoint (transform.position);
         go.guiText.pixelOffset = new Vector2(screenPos.x, screenPos.y);
         go.guiText.fontSize = 14;
     }
 }