class Starting_window(Tkinter.Tk):	#First instruction window
	def __init__(self, parent):
		Tkinter.Tk.__init__(self, parent)
		self.parent = parent
		self.initialize()
		self.geometry("350x270+%d+%d" %((self.winfo_screenwidth() - 350) / 2,
										(self.winfo_screenheight() - 270) / 2))

	def initialize(self):

class Starting_window(Tkinter.Tk):	#First instruction window
	def __init__(self,parent):
		Tkinter.Tk.__init__(self,parent)
		self.parent = parent
		self.initialize()
		self.geometry("350x270")