Getting mad on a rollover button

:h:i m getting mad:puzzled:, reading for hours ressources on the net… i always have a bug message telling me i did an error. i want to use an actionscript code not the tween function.

i created a button named “button”, and want it to be black on rollover and becoming 30% alpha on rollOut but progressively, in a fading effect

button.onEnterFrame = function(){
}
button.onRollOver = function (){
this._alpha++;
if(bouton._alpha>=100) {
delete this.onEnterFrame;
button.onRollOut = function (){
this._alpha–;
if(button._alpha<=30) {
delete this.onEnterFrame;
}
}
}

i know i did an error… and tried maybe dozen of codes found on internet, nothing works. I have Flash Mx. thanx for your help