function pictureScrollLeft(idname, size) {
	var nowX = document.getElementById(idname).scrollLeft;
	if (nowX <= size) {
		document.getElementById(idname).scrollLeft = 0;
	} else {
		document.getElementById(idname).scrollLeft = nowX - size;
	}
}
function pictureScrollRight(idname, size) {
	var nowX = document.getElementById(idname).scrollLeft;

	if (nowX > document.getElementById(idname).width - (size * 2)) {
			document.getElementById(idname).scrollLeft = document.getElementById(idname).width - size;
	} else {
		document.getElementById(idname).scrollLeft = nowX + size;
	}
}