window.onload = function() {
	MM_preloadImages('image/choiwaru2_21-over.jpg',
					 'image/choiwaru2_28-over.jpg',
					 'image/choiwaru2_32-over.jpg',
					 'image/mainimg_12-over.jpg');
}

function changeImage(obj, dir) {
	var img = $("main_pic");
	if (img.alt != obj.alt) {
		img.src = "http://" + location.hostname + "/common/image.php?dir=" + dir + "&filename=" + obj.alt + "&size=380";
		img.alt = obj.alt;
		Spry.Effect.DoFade("main_pic");
	}
}