Another Newbie question :)

I seem to understand the basic idea behind the fold function, i think but do not seem to be able to write them myself. My understanding is that it works by replacing every constructor with a fold ? Could anyone please point me in the direction of a suitable resource of attempt to explain this to me :) Cheers, Paty _________________________________________________________________ Hot chart ringtones and polyphonics. Go to http://ninemsn.com.au/mobilemania/default.asp