JS1k: The JavaScript code golfing competition

w=window;m=Math;d=document;l="addEventListener";i=113;s=d.body.style;s.backgroundColor=gc();s.margin=0;c=d.getElementById("c");t=c.getContext("2d");c.width=w.innerWidth;c.height=w.innerHeight;x=c.width*.5;y=c.height*.5;o=gc();d[l]("mousemove",function(a){x=a.clientX;y=a.clientY},0);d[l]("click",function(a){clearInterval(i);r=100;i=setInterval(function(){t.beginPath();t.fillStyle=o;t.arc(x,y,r,0,m.PI*2,true);t.fill();r+=r*.5;if(r>c.width){clearInterval(i);s.backgroundColor=o;o=gc();}},20);},0);setInterval(function(){t.clearRect(0,0,c.width,c.height);t.beginPath();t.fillStyle=o;t.arc(x,y,100,0,m.PI*2,true);t.fill();},10);function gc(){return 'rgb('+rr()+','+rr()+','+rr()+')'};function rr(){return m.floor(m.random()*255)}

dz13aW5kb3c7bT1NYXRoO2Q9ZG9jdW1lbnQ7bD0iYWRkRXZlbnRMaXN0ZW5lciI7aT0xMTM7cz1kLmJvZHkuc3R5bGU7cy5iYWNrZ3JvdW5kQ29sb3I9Z2MoKTtzLm1hcmdpbj0wO2M9ZC5nZXRFbGVtZW50QnlJZCgiYyIpO3Q9Yy5nZXRDb250ZXh0KCIyZCIpO2Mud2lkdGg9dy5pbm5lcldpZHRoO2MuaGVpZ2h0PXcuaW5uZXJIZWlnaHQ7eD1jLndpZHRoKi41O3k9Yy5oZWlnaHQqLjU7bz1nYygpO2RbbF0oIm1vdXNlbW92ZSIsZnVuY3Rpb24oYSl7eD1hLmNsaWVudFg7eT1hLmNsaWVudFl9LDApO2RbbF0oImNsaWNrIixmdW5jdGlvbihhKXtjbGVhckludGVydmFsKGkpO3I9MTAwO2k9c2V0SW50ZXJ2YWwoZnVuY3Rpb24oKXt0LmJlZ2luUGF0aCgpO3QuZmlsbFN0eWxlPW87dC5hcmMoeCx5LHIsMCxtLlBJKjIsdHJ1ZSk7dC5maWxsKCk7cis9ciouNTtpZihyPmMud2lkdGgpe2NsZWFySW50ZXJ2YWwoaSk7cy5iYWNrZ3JvdW5kQ29sb3I9bztvPWdjKCk7fX0sMjApO30sMCk7c2V0SW50ZXJ2YWwoZnVuY3Rpb24oKXt0LmNsZWFyUmVjdCgwLDAsYy53aWR0aCxjLmhlaWdodCk7dC5iZWdpblBhdGgoKTt0LmZpbGxTdHlsZT1vO3QuYXJjKHgseSwxMDAsMCxtLlBJKjIsdHJ1ZSk7dC5maWxsKCk7fSwxMCk7ZnVuY3Rpb24gZ2MoKXtyZXR1cm4gJ3JnYignK3JyKCkrJywnK3JyKCkrJywnK3JyKCkrJyknfTtmdW5jdGlvbiBycigpe3JldHVybiBtLmZsb29yKG0ucmFuZG9tKCkqMjU1KX0=

Original source not submitted