var alphaTall:Number = 1;
var circleTall:uint = 10;
while(alphaTall > 0){
    graphics.lineStyle(2, 0x000000, alphaTall);
    graphics.drawCircle(250, 200, circleTall);
    circleTall = circleTall+10;
    alphaTall = alphaTall-0.1;
}