Change GUI on mouse over

So, my Main Camera has a GUIText that appears as a period in the center of the screen. I want to change the period to an "o" when the camera mouses over a GameObject that has that script. The script is meant for the object in question, by the way! Here's the script.

 var other : GameObject; //What object is this script subject to?

function OnMouseOver() { //Is the cursot over the object? other.guiText.text = "o"; //Change GUIText to "o" }

The script doesn't work, aside from not having any errors. The script runs fine, but the GUIText doesn't change!

EDIT: I have a new script that does work. It took me a long time, but it also changes the font color as well! Here's the code:

 var object : GameObject;
 private var textDisplay : GUIText;
 
 function OnMouseEnter() {
  object.guiText.material.color = Color.green; 
  object.guiText.text = "o";;
 
 }
 function OnMouseExit() {
  object.guiText.material.color = Color.white;
  object.guiText.text = ".";
 }

So there you have it.