Multi tool use

How to destroy the First Window?

I am making the GUI Chat Program using the following Steps as following:

After the Login is successful, the First Window has not been destroyed.
(OS : window 7, Python 2.7)

Please, help me to destroy the First Window successfully!!

chat_login.py:

from socket import *
import thread, time
import msvcrt as m
from tkinter import *
from tkinter import scrolledtext
import os
import sys

login_w = Tk()
login_w.title("The SCH Chat-Client V0.1")

login_w.geometry('400x100')

s = socket(AF_INET, SOCK_STREAM)
id_label = Label(login_w,text=" I D : " )
id_label.grid(column=0, row=0)

id_txt = Entry(login_w)
id_txt.grid(row=0, column=1)

pass_label = Label(login_w,text="Password : " )
pass_label.grid(column=0, row=1)

pass_txt = Entry(login_w)
pass_txt.grid(row=1, column=1)

def recvMsg(sock):
while True:
recvmsg = sock.recv(1024)

def Con_Clicked():
host = "127.0.0.1"
port = 8008
print host
try:

s.connect((host, 8008))
thread.start_new_thread(recvMsg, (s, ))
time.sleep(1)
nickmsg = id_txt.get()
s.send(nickmsg)
time.sleep(2)
print 'Wait!'
os.system('python chat_client_testG.py')

except:
print "Wrong address!"

con_btn = Button(login_w, text="Login" , command = Con_Clicked )
con_btn.grid(column=0, row=2)

login_w.mainloop()


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