Define GUILayout (horiz)

How can I define the size of a horizontal GUILayout?

I have this at the moment, but would like to set it out like I would a GUI.box (so i can choose position and size)

GUILayout.BeginHorizontal("");

solved it:

				GUILayout.BeginHorizontal("",  GUILayout.Width(100), GUILayout.Height(100));

will leave this here for others.