Loading Screen

How to make a simple Loading Screen.?

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I realize I was wrong to direct you to that quest. Cos the answer to it is long and not working according to others.

Now I just did it in my own game, Here is to share how to do it.

static var loading_on : boolean;
var Loading_Screen:Texture2D;

function OnGUI () {
        GUI.matrix = Matrix4x4.TRS(Vector3.zero, Quaternion.identity, Vector3(1.0*Screen.width/GameData.X, 1.0*Screen.height/GameData.Y, 1.0));
        GUI.depth =-10;
        GUI.Box(new Rect(0,0,1024,768),Loading_Screen);