Example
Growing circles
Code of examle
var interval_1=0;
function startShow()
{
	var r = Math.floor(Math.random() * (254)),
		g = Math.floor(Math.random() * (254)),
		b = Math.floor(Math.random() * (254)),
		x = Math.floor(Math.random() * (439)),
		y = Math.floor(Math.random() * (554)),
		color = "rgba("+r+", "+g+", "+b+", 0.5)",
		filled = true,
		radius = 1;
	jc.circle(x, y, radius, color, filled)
		.animate({radius:100, opacity:0}, 1500, function(){
			this.del();
		});
}

function onload_1()
{
	jc.start(idCanvas, true);
	interval_1 = setInterval(startShow, 200);
}

function start_1(idCanvas)
{
	if(interval_1)return;
	onload_1();
}

function stop_1(idCanvas)
{
	clearInterval(interval_1);
	interval_1 = 0;
	jc.clear(idCanvas);
}
View of example