How to break a columnar transposition cipher?
(Although your question is for a long time ago) Transposition ciphers don't change the frequency of letters in their ciphertexts. So, you can implement a frequency attack. For decryption by this you only need the table of frequency of English letters and your ciphertext.
(Your encryption scheme here is a Columnar transposition with a key that all its letters are in order except 2 of them.)