(function($){
	
/* smoothScroll　マウスｲﾍﾞﾝﾄによる画像変化を実装します。
=========================================== */
$.fn.imgSwitcher = function (options) {
	
	// デフォルト設定
	var imgSETTINGS = {
		normal			:[true, "_n."], // 通常時
		mouseover 	:[true, "_o."], // マウスオーバー、マウスアップ
		active 			:[true, "_o."], // アクティブ
		mousedown	:[false, "_d."]  // マウスダウン
	}
	if(options) $.extend(imgSETTINGS, options);

	$(this).each(function(){
		var $this = $(this);
		var n = this.src;
		
		// 1. preload images
		var obj = new Object();
		if(!obj[n]){
			for (var k in imgSETTINGS) {
				imgSETTINGS[k];
				if(imgSETTINGS[k][0]){
					var x = n.replace("_n.", imgSETTINGS[k][1]);
					obj[imgSETTINGS[k]] = new Image();
					obj[imgSETTINGS[k]].src = x;
				}
			}
		}
		
		// 2. set event handler
		var notChange = "x_stay";
		if(!($this.hasClass('x_escape') && this.src.lastIndexOf(imgSETTINGS.active) > -1)){
			$this.on({
				mouseover: function(){
					if(imgSETTINGS.mouseover[0]&&!$this.hasClass(notChange)) this.src = obj[imgSETTINGS.mouseover].src;
				},
				mouseout: function(){
					if(imgSETTINGS.normal[0]&&!$this.hasClass(notChange)) this.src = obj[imgSETTINGS.normal].src;
				},
				mousedown: function(){
					if(imgSETTINGS.mousedown[0]&&!$this.hasClass(notChange)) this.src = obj[imgSETTINGS.mousedown].src;
				},
				mouseup: function(){
					if(imgSETTINGS.mouseover[0]&&!$this.hasClass(notChange)) this.src = obj[imgSETTINGS.mouseover].src;
				}
			});
		}
		
		// 3. judge active page
		if(typeof activePageName != "undefined" && activePageName != "") {
			if(n.match(activePageName) != null){
				$(this).attr("src", obj[imgSETTINGS.active].src).addClass(notChange);
			}
		}
	});
};



})(jQuery);