16) + "ff" + (Math.round(xr)).toString(16);
		left.style.backgroundColor = "#ff" + (Math.round(xr)).toString(16) + (Math.round(xr)).toString(16);
	}

	var comment = document.getElementById("comment_" + (no + 1));
	if(Math.abs(xl - xr) < 3){
		comment.innerHTML = "They are almost the same.";
	}else if(xl > xr){
		if(xl > 20*xr){
			comment.innerHTML = "The one on the right is more than 20 times faster!";
		}else if(xl > 10*xr){
			comment.innerHTML = "The one on the right is more than 10 times faster!";
		}e