from Tkinter import *
import webbrowser

def callback():
    webbrowser.open_new('gms.org')

top = Tk()
L1 = Label(top, text="User Name")
L1.grid(row=0, column=0)
E1 = Entry(top, bd = 5)
E1.grid(row=0, column=1)

L1 = Label(top, text="Password")
L1.grid(row=1, column=0)
E1 = Entry(top, bd = 5)
E1.grid(row=1, column=1)

MyButton1 = Button(top, text="Submit", width=10, command=callback)
MyButton1.grid(row=3, column=1)

top.mainloop()