THE White Stripes frontman Jack White's on-going feud with British singer/songwriter BILLY CHILDISH is heading for the courts over a spoof poster featuring the two protagonists. The Aquarium gallery in London is currently exhibiting Childish's drawings and has decided to pay tribute to the musicians' battle by selling a limited edition poster, billing a fictional boxing fight between "Jack 'Whingy' White" and "'Bitter' Billy Childish", which includes the footer, "You're a big lad Jack, but you're out of shape." White's lawyers have contacted the Aquarium, claiming the poster violates The White Stripes' intellectual property rights and should be withdrawn from sale on internet auction site eBay. Gallery owner STEVEN LOWE says, "It was just a bit of fun but these people don't seem to have a sense of humour. I did the poster to entertain Billy and our customers really, but then we go and get this letter. "I've written to The White Stripes' management to see exactly what copyright we're infringing." Childish infuriated White when he told the American edition of GQ magazine, "I can't listen to that stuff. They don't have a good sound. Jack's half into the sound and music, but then he wants to be a pop star as well, so you've got a big problem." Furious White responded on his band's website, writing, "When you take someone else's music and put your own lyrics on top of it, it's still called plagiarism. Something Mister Childish hasn't learned yet."