[Mr. Fixit]

for (k = 7; k < 10; k++) {
	_root["left_b" + k].val = 0;
	_root["left_b" + k].k = k;
	_root["left_b" + k].onRollOver = function () {
		this.onEnterFrame = function () {
			if (this._x <= 50) {
				delete this.onEnterFrame;
				delete this.onRollOver;
			}
			this.val += this.k/5;
			this._x -= this.val;
		};
	};
}