GUI style causing problem

GUIUtility.RotateAroundPivot(angle, new Vector2(Screen.width - (71 Screen.width / 480) + ((61 Screen.width / 480)/2), 5 + ((61 * Screen.height / 320)/2)));

if (GUI.Button(new Rect((Screen.width - (71 Screen.width / 480)), 5, 61 Screen.width / 480, 61 * Screen.height / 320), pcont))

Here pcont is a GUIContent having Texture. I am trying to rotate image continuously. This code is working perfectly. So the image rotates 360 degrees. But when I add "new GUIStyle()" in GUI.Button, it changes pivot point and I am getting bizarre result.