Fade out preload bar when loaded!

I would like to create a preload bar that fades out when the content is loaded. Here is the code I have so far, it works ok but the fade out is too long. I’ve tried tinkering with the code further, but it starts to fade out half way through.

onClipEvent (enterFrame) {
loading = _parent.getBytesLoaded();
total = _parent.getBytesTotal();
percent -= (percent-((loading/total)100)).25;
per = int(percent);
percentage = per+"%";
loadBar._width = per*4.5;
if (percent>100&& _this._alpha <= 20) {
this._alpha -=1;

Any help greatly appreciated!