var xAngle = 0,
 	yAngle = 0;
	
document.addEventListener('keydown', function(e) {

	switch(e.keyCode) {
		
		case 37: // left
			yAngle -= 90;
			break;
		
		case 38: // up
			xAngle += 90;				
			break;
		
		case 39: // right
			yAngle += 90;
			break;
			
		case 40: // down
			xAngle -= 90;
			break;
	};
	
	if (e.keyCode >= 37 && e.keyCode <= 40) e.preventDefault();
	
	document.getElementById('cube').style.webkitTransform = "rotateX("+xAngle+"deg) rotateY("+yAngle+"deg)";
		
}, false);