package {
	import flash.display.Sprite;
    import flash.events.*;
    import flash.utils.Timer; 
	import flash.utils.setInterval;
    import caurina.transitions.Tweener;

public class Howa extends Sprite {

var ci = new Array();
       var timer:Timer;
       
 		public function Howa():void {
 		    timer = new Timer(20);
            timer.addEventListener(TimerEvent.TIMER, posi);
            timer.start();
 		}
 		
 		function posi(e:Event):void{
 		    var color = 0xFFFFFF * Math.random();
            var cir:Cir = new Cir(color);
            cir.x = mouseX + (40 * Math.random() - 20);
            cir.y = mouseY+ (40 * Math.random() - 20);
            addChild(cir);
            cir.alpha -= 0.1;
            if(cir.alpha == 0){
                removeChild(cir);
            }
            Tweener.addTween(cir, {
				time: 3,
				scaleX: 5, 
				scaleY: 5,   
				alpha: 0,
				onComplete: function():void{
					removeChild(cir);
				}
			});

}

}
}
	import flash.display.Sprite;
	
    class Cir extends Sprite{
        var l:Number = 5;
        function Cir(col):void{
            graphics.beginFill(col);
            graphics.drawCircle(0,0,l);
            graphics.endFill();
        }
    }

flash on 2009-10-6

flash swf thumbnail