var fadeTime = 400;
var delayTime = 6000;
var autoFlg = true;
var currentNo = 1;
var oldNo = 1;
var imageLength;
var tid;
	
$(function(){
	imageLength = $("div#mainImgList > div").size();	
	if (imageLength < 2) return;
	
	$("div#mainImgList div").hide();
	$("div#mainImgList div:eq(0)").fadeIn(600);

		$("ul#main-img-switchs li").hover(function() {
		var targetNo = $(this).attr("id").replace("nav-mainitem-", "");

		if (targetNo != currentNo) {
			oldNo = currentNo;
			currentNo = targetNo;
			changeImage();
			if (autoFlg) {
				clearInterval(tid);
				tid = setInterval("setNo()",delayTime);
			}
		}
	});

	if (autoFlg) tid = setInterval("setNo()",delayTime);
});

function setNo(){
	oldNo = currentNo;
	currentNo++;
	if (currentNo >= (imageLength+1))
	{
		currentNo = 1;
	}
	changeImage();
}
	
function changeImage(){
	$("div#mainImgList div:eq(" + (oldNo - 1) + ")").fadeOut(fadeTime);
	$("div#mainImgList div:eq(" + (currentNo - 1) + ")").fadeIn(fadeTime);

	if(currentNo <= 2) {
		var trgimgIDImg = $("ul#main-img-switchs li a:eq(" + (currentNo - 1) + ")").attr("rel");
		$("#machineImg").attr('src', 'images/top3/pic_' + trgimgIDImg +'.png');
	} else {
		if(currentNo == 3) {
			$("#machineImg").attr('src', 'images/top3/pic_machine.png');
		}
	}

	$("ul#main-img-switchs li a:eq(" + (oldNo - 1) + ")").removeClass("current");
	$("ul#main-img-switchs li a:eq(" + (currentNo - 1) + ")").addClass("current");
}