JS1k: The JavaScript code golfing competition

with(b.style){background='#242424';padding='0px';margin='0px';}var g=document.createElement('canvas');g.style.position=c.style.position='absolute';var W=innerWidth;H=innerHeight;g.style.zIndex=1;c.style.zIndex=2;z=g.getContext('2d');b.appendChild(g);c.width=W;g.width=W;c.height=H;g.height=H;E(W/2,H/2,W/8,"#242424",z);c.addEventListener('mousemove',S,false)
function E(x,y,r,c,o){var P=Math.PI;q=[1,x,y,c];q[0]*=r;with(o){fillStyle=q[3];lineWidth=.001;beginPath();arc(q[1]-q[0],f=q[2]-q[0],q[0],P*.8,P*2);arc(q[1]+q[0],f,q[0],P,P*2.2);lineTo(q[1],q[2]+q[0]*2);closePath();fill();stroke()}}	
function S(k){var X=k.clientX+Math.random()*50,Y=k.clientY+Math.random()*50,j=-1,u=0,t=5,c=z.isPointInPath(X,Y)?"rgb("+(Math.random()*55+200|0)+",0,0)":"rgb(0,"+(Math.random()*55+200|0)+",0)";j=setInterval(function(){if(u<4){t++;u++;E(X,Y,t,c,a);}else{clearInterval(j);j=-1}},25,0)}

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