var boxes:Array = ["box1", "box2", "box3", "box4", "box5"];
for (var i:Number = 0; i<boxes.length; i++) {
	this[boxes[i]].onRelease = function() {
		var emptyPos:Array = new Array();
		emptyPos.push(this._x, this._y);
		var dx:Number = this._x-empty._x;
		var dy:Number = this._y-empty._y;
		dist = Math.sqrt(dx*dx+dy*dy);
		if (dist<=51) {
			this._x = empty._x;
			this._y = empty._y;
			empty._x = emptyPos[0];
			empty._y = emptyPos[1];
		}
	};
}