Fade in and out, texture separation

Hi, I want to make a fade in and fade out animation, but I cannot seem to find a way to change the alpha of the "Fade" texture ONLY. Left like this, the code fades the "Background" texture as well and at t=2 there is nothing to see on the screen.

I know I can solve this problem by separating the two textures into separate scripts or making one of them a GUI Texture component, but I would like to have both in the same script. Any help on this matter or suggestions on the code in general will be greatly appreciated. Thank you!

 ///*Splash Vars*///
 var Alpha:float;
 
 /*Images*/
 var Fade:Texture;
 var Background:Texture;
 
 
 
 ///*Code*///
 
 function Start()
 {
     audio.volume=PlayerPrefs.GetFloat("Volume");
     yield FadeAnimation(1.0,0.0,2.0);
     yield WaitForSeconds(2);
     yield FadeAnimation(0.0,1.0,2.0);
     Application.LoadLevel(Application.loadedLevel+1);
 }
 
 function OnGUI()
 {
     GUI.color.a=Alpha;
     GUI.DrawTexture(Rect(0,0,Screen.width,Screen.height),Fade);
     GUI.DrawTexture(Rect(0,0,Screen.width,Screen.height),Background);
 }
 
 function FadeAnimation(AlphaStart:float,AlphaEnd:float,Duration:float)
 {
     for (var t:float=0.0;t<1.0;t=t+Time.deltaTime*1.0/Duration)
     {
         Alpha=Mathf.Lerp(AlphaStart,AlphaEnd,t);
         yield;
     }
 }