Search in textfiles?

[Martin Johansson]

import string

word = raw_input("Write a word ")
c=open('10 Maj 08_580,2183,106_nyheter_1022,00.html.txt', 'r')
textstring = c.read()
index = string.find(textstring, word)
if index > 0:
    print "yes the word exists in the textfile"
else:
    print "it doesn´t exist"

this code I rote, but what can be done if big letters should not be threated
different than small letters?

(Martin should be the same as martin)

Martin Johansson
pt00mjo at student.bth.se