Help Changing Materials On Button Click

Here is the script I am using to select objects, but in the "function manipulateChosenTransform ()", it works great for object selection, but isn't playing nice to change materials. What I am trying to do is if an object is currently selected, I want it's material to change from a diffuse to a diffuse transparent so only the selected objects opacity can be messed with by a slider. But once you select another object, the previously selected object goes back to it's difuse material. Any help is much appreciated.

var hSliderValue : float = 1.0;

var opacityText : GUIStyle;

var arrayOfTransforms : Transform [];

var guiRectangle : Rect = Rect(200, 200, 300, 300);

var chosenTransform : Transform;

var originalMaterial : Material;

var replaceMe : Material;

function OnGUI ()

{

 /* make sure the array isn't null or empty */



 if ( ! arrayOfTransforms || arrayOfTransforms.length == 0 ) {

     Debug.LogError("Please initialize array of transforms...");

     return;

 }



 GUILayout.BeginArea(guiRectangle);





 for ( var i = 0; i < arrayOfTransforms.length; i ++ ) {



     /* use a variable to keep track of the current Transform */



     var thisTransform = arrayOfTransforms[i];



     /* draw a button for each item in the array */



     if ( GUILayout.Button("Choose " + thisTransform.name) ) {



         /* if the button is pressed, store the current transform */



         chosenTransform = thisTransform;

     }

 }





 GUILayout.Box("You have chosen: " + chosenTransform.name);



 GUILayout.EndArea();

 

 getValue();

 

 hSliderValue = GUI.HorizontalSlider (Rect (110, 325, 150, 30), chosenTransform.renderer.material.color.a, 0.0, 1.0);

 GUI.Label (Rect (55, 323, 100, 20), "Opacity", opacityText);

 

 manipulateChosenTransform ();

}

function getValue()

{

 return hSliderValue;

}

function changeTexture() {

 chosenTransform.renderer.material= replaceMe;

 

}

function changeTextureToNormal() {

 chosenTransform.renderer.material= originalMaterial;

 

}

function manipulateChosenTransform ()

{

 if ( ! chosenTransform ) {

     return;

 }

 

  

  

}

     if (chosenTransform) {

       changeTexture();

       

   

}

else changeTextureToNormal();

 print("You have chosen to do something to " + chosenTransform.name);

 print("Here is its current position: " + chosenTransform.position);

 

 chosenTransform.renderer.material.color.a = hSliderValue;

 

function Awake ()

{

 if ( ! arrayOfTransforms || arrayOfTransforms.length == 0 ) {

     Debug.LogError("Please initialize array of transforms...");

     return;

 }





 chosenTransform = arrayOfTransforms[0];

}