Alpha Changes with Actionscript

ok. I’m using Flash 8, and every time I run the code I get an error message. It goes like this.

fadebox1._alpha = 0;

fader = function() {

             while (fadebox1._alpha < 100) {
                        fadebox1._alpha = +2;

After I do that, flash freezes for a while and tells me to cancel my script otherwise I’m gonna slow down.

All I want to do is create a fade in animation for my fadebox1 without using the timeframe, am I doing something wrong here?