Smooth movement sometimes not working

programming flash
1

Hi everybody,

I have the code below, creating movements and changes of alpha values of three mc.
When I test the animation sometimes the animation is smooth, sometimes it isn’t. Is there anything wrong with this code?
Thanks a lot


mc3._alpha = 0;
//
function fvmoving() {
	mc1._xscale += (50 - mc1._xscale) * 0.3;
	mc1._yscale += (50 - mc1._yscale) * 0.3;
	mc1._y += (300 - mc1._y) * 0.3;
	if (mc1._xscale > 50 - 1 && mc1._xscale < 50 + 1 && mc1._yscale > 50 - 1 && mc1._yscale < 50 + 1 && mc1._y > 300 - 1 && mc1._y < 300 + 1) {
		mc1._xscale = 50;
		mc1._yscale = 50;
		mc1._y = 300;
		mc2._xscale += (50 - mc2._xscale) * 0.3;
		mc2._yscale += (50 - mc2._yscale) * 0.3;
		if (mc2._xscale > 50 - 1 && mc2._xscale < 50 + 1 && mc2._yscale > 50 - 1 && mc2._yscale < 50 + 1) {
			mc2._xscale = 50;
			mc2._yscale = 50;
			mc3._alpha += (100 - mc3._alpha) * 0.3;
			if (mc3._alpha > 100 - 1 && mc3._alpha < 100 + 1) {
				mc3._alpha = 100;
				clearInterval(fvmov);
			}
		}
	}
	updateAfterEvent();
}
//
var fvmov = setInterval(fvmoving, 50);