Good time waster: simple sliding tile puzzle

nooffMy dad sent me the url to this java-based slider tile puzzle, and it has killed half my work day so far. He solved it in 48 moves. I guess 44 is the minimum. I can't solve it! If everyone who reads Boing Boing spends ten minutes on it, it will result in 312.5 man-days of wasted time! (It didn't work in Safari for me; I had to use IE) Link