bbcode generator halp

I am trying to write a simple bbcode Python script.  How can I improve this?  Also, how can I get rid of the ":arg" when the result is actually printed.  YES I KNOW ITS PROBABLY FUCKING UGLY AND I AM A SHITTY PROGRAMMER FORCED INDENTATION OF ANUS READ SICP ETC

import string

b = '[b]'
b2 = '[/b]'

u = '[u]'
u2 = '[/u]'

o = '[o]'
o2 = '[/o]'

i = '[i]'
i2 = '[/i]'

s = '[s]'
s2 = '[/s]'

m = '[m]'
m2 = '[/m]'

c = '[code]'
c2 = ''

sp = ''
sp2 = ''


bbcode = raw_input('ENTER ANUS, RECEIVE HAX: ')

if ':b' in bbcode:
    print b + bbcode + b2
   
if ':u' in bbcode:
    print u + bbcode + u
   
if ':o' in bbcode:
    print o + bbcode + o2

if ':i' in bbcode:
    print i + bbcode + i2
   

if ':s' in bbcode:
    print s + bbcode + s2

if ':m' in bbcode:
    print m + bbcode + m2
   
if ':c' in bbcode:
    print c + bbcode + c2

if ':sp' in bbcode:
    print sp + bbcode + sp2[/code]

>>9
I wanted to post my Haskell BBCode engine but it would take like 5 posts.
Still, my engine had working [define]s.