Canvas Spinny

This will make a nice semi transparent spinner for you.

var spinnyCanvas = function(left, top) {
    var conti = false;
    var self = this;
    this.stop = function() {
        this.conti = false;
    }
    this.start = function() {
        console.log(self.conti)
        if (!self.conti) {
            self.conti = true;
            draw();
        }
    }
    var dim = 48
    var canvas = document.createElement('canvas')
    var context = canvas.getContext('2d')
    document.body.appendChild(canvas)
    canvas.height= dim
    canvas.width = dim
    canvas.theta = 0
    canvas.dtheta = -.09
    canvas.style.position = 'fixed'
    canvas.style.top = top + 'px'
    canvas.style.left= left + 'px'

    var draw = function() {
        canvas.width = canvas.width
        var r = dim / 16
        var x, y
        var i, L = 5
        for (i = 0; i < L; i++) {
            x = dim / 2 + dim * .3 * Math.sin(canvas.theta + i * 1.1 * Math.PI / L)
            y = dim / 2 + dim * .3 * Math.cos(canvas.theta + i * 1.1 * Math.PI / L)
            context.beginPath()
            context.fillStyle = "rgba(128,128,128," + (1 - i / L) + ")"
            context.arc(x, y, r, 0, 2*Math.PI, false)
            context.fill()
            context.closePath()
        }
        canvas.theta += canvas.dtheta
        if (self.conti) {    
            requestAnimationFrame(draw)
        }
    }
    return this
}