_xscale di un mc: problema

[andr3a]

onClipEvent (enterFrame) {
	if (this.__toScale == 'BIG' && this._xscale<200) {
		newscale = (this._xscale+100)/50;
		this._xscale += newscale;
		if( this._xscale + newscale >= 200 ) {
			this.__toScale == 'SMALL';
		}
	}
	else if (this.__toScale == 'SMALL' && this._xscale>20) {
		newscale = (this._xscale-100)/50;
		this._xscale += newscale;
		if( this._xscale + newscale <= 20 ) {
			this.__toScale == 'BIG';
		}
	}
	else {
		this.__toScale == 'BIG'; // scegli come partire
	}
}