GUI FullScreen Resolution questin/how to ?

Hi

So I am making some 2D Main Menu for my game and I have a question. Is there any way that the main menu can adjust automaticly on resolution and on fullScreen ??

Thnx
Here is the code :


function OnGUI()
{
if( showWindow == true)
{
GUILayout.BeginArea( Rect( Screen.width / 2 - buttonWidth /2 - centerScreen, Screen.height / 2 - 200 , buttonWidth, 400));
if(GUILayout.Button("Start Game", GUILayout.Height( buttonHeight)))
{
Application.LoadLevel("Test_Level");
}
GUILayout.Space( spacing);
if( GUILayout.Button("Multiplayer", GUILayout.Height( buttonHeight)))
{

}
GUILayout.Space( spacing);
if(GUILayout.Button("Options", GUILayout.Height( buttonHeight)))
{

showOption = true;
}
GUILayout.EndArea();

if( showOption == true)
{
GUILayout.BeginArea(Rect( Screen.width / 2 - buttonWidth / 2 +100, Screen.height / 2 - 200, buttonWidth, 400));
if(GUILayout.Button("Windowed ON" , GUILayout.Height( 50)))
{
Screen.fullScreen = false;
centerScreen = 0;
}
GUILayout.Space( spacing);
if(GUILayout.Button("Windowed Off" , GUILayout.Height( 50)))
{
Screen.fullScreen = true;
centerScreen = 400;
}



GUILayout.EndArea();
}
}
}