for (i=0; i<4; i++) {
	for (x=0; x<4; x++) {
			Button.prototype.nextF = function() {
	this.onRelease = function() {
		anim+i.nextFrame();
	};
};
Button.prototype.prevF = function() {
	this.onRelease = function() {
		anim+i.prevFrame();
	};
};
Button.prototype.play = function() {
	this.onRelease = function() {
		anim+i.play();
	};
};
Button.prototype.stop = function() {
	this.onRelease = function() {
		anim+i.stop();
	};
};
		but+i+x.nextF();
		but+i+(x+1).prevF();
		but+i+(x+2).play();
		but+i+(x+3).stop();
	}
}