GUI Texture Control Problem !!!!!

Hi

I have a 2D Texture Background which is drawn like

GUI.Drawtexture (new Rect( 0,0,Screen.Width, Screen.Height),BackGround);

and another texture say Table or ScoreBoard drawn with in it...

GUI.DrawTexture(new Rect(50,50, 500,400), ScoreBoard);

say now their is change in resolution and all the things go messy........... so is their any way so that i can change the positions or scale them according to ASPECT RATIO or with Change in RESOLUTION to control it in different scaled devices.

Thanks in Advance