why is the texture not at the same position as the button?
var select01 : GUITexture;
function OnGUI(){
if (GUI.Button (Rect ((Screen.width * 0.1) - 23, (Screen.height * 0.4) , 55, 64), "12 sec")) {
select01.guiTexture.pixelInset = Rect ((Screen.width * 0.1) - 23, (Screen.height * 0.6), 65, 74);
}