Hide text in entry box when i click on it.(GUI using Tkinter in python)

[hmmeeranrizvi18 at gmail.com]

Hello Guys,
Here i am creating a entry box with some text,i need to hide the text when i click on it.
Here is my code

from Tkinter import *
obj = Tk()
b = Entry(obj,width=100)
b.insert(0,"Enter the value to search")
b.pack()
mainloop()