Y le podemos recortar un poco mas :P
Código:
buttons = [excel_mc, word_mc, per_mc];
for (a = 0; a < buttons.length; a++)
{
buttons[a].onRollOver = function() {
this._xscale = this._yscale = 125;
};
buttons[a].onRollOut = function() {
this._xscale = this._yscale = 100;
};
buttons[a].onPress = function() {
this.startDrag();
};
buttons[a].onRelease = function() {
this.stopDrag();
};
}