Cracking Playfair code

I need to crack a Playfair encoded text without knowing the keyword. While searching the internet I found a way to do this using a 'shotgun climbing hill' method. Problem is, I can't decide how to quantify one solution against the other. I'm pretty sure the text is in English.

Any help would be appreciated.

UPDATE

This is encrypted text: http://pastebin.com/pEUXDvq1 .

Thanks for pointing me to pastebin.com.

Ok I will give a fairly short answer, as this is homework you should figure out the details :-). To begin with the code is

BDEWIKOCGHSMPQRZUVXYNFLAT

The decrypted text is a short story which be found on this website (formatted). You can use this as a online tool for decrypting, still you will (of course) lose all formatting and find the position of the spaced of all words on your own. A detailed approach how to break Playfair can be found here, basically it tries to analyse the frequency of the letters which is of course harder when blocks are substituted instead of single characters.

Finally a ready-coded solver written in C can be found here (coded by J.W. Stumpel). I hope that was helpful.