JS1k: The JavaScript code golfing competition

function draw(){c.drawImage(B,0,0,Z,Z),c.drawImage(A,0,0,Z,Z),c.font="40px Arial",c.strokeText("C12H17N2O4P",Z/5,Z/2),C.drawImage(A,99*(2*Math.random()-1),99*(2*Math.random()-1)),D.fillStyle=C.fillStyle="tan",C.fillRect(0,0,Z,Z),C.drawImage(A,1,2,Z,Z),D.drawImage(B,19*(2*Math.random()-1),29*(2*Math.random()-1)),D.fillRect(0,0,Z,Z)}
                                                                  setInterval(draw,T=10,A=document.createElement("canvas"),B=document.createElement("canvas"),B.height=B.width=Z=500,D=B.getContext("2d"),C=A.getContext("2d"),c.globalCompositeOperation="hard-light",D.globalCompositeOperation=C.globalCompositeOperation="difference");

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