Shrek2, an animated film sequel about a lovesick green ogre, a talking donkey with attitude and a swashbuckling puss in boots, was one of the most eagerly awaited films at Cannes this year. The original was a word-of-mouth hit and the sequel (which opens here on 2 July) has done so well at the box office in America that it is already well on its way to becoming the biggest grossing film of all time. Matthew Sweet investigates the Shrek phenomenon. Producer Jerome Weatherald