tById("slider_" + (no + 1)).getContext("2d");
	x = slider_xs[no] + 48 + 0.5;

	ctx.clearRect(0, 0, 608, 128);
	ctx.beginPath();
	ctx.moveTo(64.5-16, 32.5);
	ctx.lineTo(0.5 + 16, 127.5 - 32);
	ctx.lineTo(607.5 - 16, 127.5 - 32);
	ctx.lineTo(607.5 - 64 + 16, 32.5);
	ctx.lineTo(64.5-16, 32.5);
	ctx.strokeStyle="#000000";
	ctx.stroke();
	ctx.closePath();
	ctx.fillStyle="#999999";
	ctx.fill();

	if(slider_set[no]){
		x_red = slider_user_xs[no] + 48 + 0.5;
		ctx.beginPath();
		ctx.moveTo(x_red, 0);
		ctx.lineTo(x