(function($) {

    $.fn.innerfade = function(options) {
        return this.each(function() {   
            $.innerfade(this, options);
        });
    };

    $.innerfade = function(container, options) {
        var settings = {
        	'animationtype':    'fade',
            'speed':            'normal',
            'type':             'sequence',
            'timeout':          2000,
            'containerheight':  'auto',
            'runningclass':     'innerfade',
            'children':         null
			
		};
        if (options)
            $.extend(settings, options);
        if (settings.children === null)
            var elements = $(container).children(); //	$(container) = targerとなる<ul>		elements = <li>タグ
        else
            var elements = $(container).children(settings.children); //elements = settings.childrenで指定したタグ
        
		if (elements.length > 1) {//追加	<li>タグの数
			
			//<ul>にスタイルを適用
            $(container).css('position', 'relative').css('height', settings.containerheight).addClass(settings.runningclass);
			
			//elementsにスタイルを適用 タグごとに深度、ポジションスタイルを適用しhide()
			for (var i = 0; i < elements.length; i++) {
                $(elements[i]).css('z-index', String(elements.length-i)).css('position', 'absolute').hide();
            };
			
			//innnerfade.next()	スタート設定
            if (settings.type == "sequence") {	//sequence処理
				//settings.timeout秒ごとにinnerfade.next()を実行
                setTimeout(function(){$.innerfade.next(elements, settings, 1, 0);}, settings.timeout);
               	//一段目をshow()
				$(elements[0]).show();
				
            } else if (settings.type == "random") {	//random処理
            	//乱数を生成
				var last = Math.floor ( Math.random () * ( elements.length ) );
                
				//settings.timeout秒ごとに do whileを実行	current == lastになるまで乱数生成し、満たしたらinnerfade.next()を実行
				setTimeout(function() {
					do { 
						current = Math.floor ( Math.random ( ) * ( elements.length ) );
					} while (last == current);             
						$.innerfade.next(elements, settings, current, last);
                }, settings.timeout);
                
				//last段目をshow()
				$(elements[last]).show();
				
			} else if ( settings.type == 'random_start') {	//random_start処理
				//sequenceに直す
				settings.type = 'sequence';
				
				//乱数生成
				var current = Math.floor ( Math.random () * ( elements.length ) );
				
				//settings.timeout秒ごとにinnerfade.next()を実行	
				setTimeout(function(){
					$.innerfade.next(elements, settings, (current + 1) %  elements.length, current);
				}, settings.timeout);
				
				//current段目をshow()
				$(elements[current]).show();
				
			} else {
				//alert(55);
				clearTimeout();
				//alert('Innerfade-Type must either be \'sequence\', \'random\' or \'random_start\'');
			}
		}
		
		
    };
	
	//current = 次表示 last = 現在表示
    $.innerfade.next = function(elements, settings, current, last) {
       	if (settings.animationtype == 'slide') {
            /*$(elements[last]).slideUp(settings.speed);
            $(elements[current]).slideDown(settings.speed);
			*/
			$(elements[last]).slideUp(settings.speed, function(){
				$(elements[current]).slideDown(settings.speed);
			});
        } else if (settings.animationtype == 'fade') {
            $(elements[last]).fadeOut(settings.speed);
            $(elements[current]).fadeIn(settings.speed, function() {
							removeFilter($(this)[0]);
						});
        } else
            alert('Innerfade-animationtype must either be \'slide\' or \'fade\'');
        
		if (settings.type == "sequence") {
            if ((current + 1) < elements.length) {
                current = current + 1;
                last = current - 1;
            } else {
                current = 0;
                last = elements.length - 1;
            }
        } else if (settings.type == "random") {
            last = current;
            while (current == last)
                current = Math.floor(Math.random() * elements.length);
        } else
			alert('Innerfade-Type must either be \'sequence\', \'random\' or \'random_start\'');
        setTimeout((function() {
            $.innerfade.next(elements, settings, current, last);
        }), settings.timeout);
				
    };

})(jQuery);

// **** remove Opacity-Filter in ie ****
function removeFilter(element) {
	if(element.style.removeAttribute){
		element.style.removeAttribute('filter');
	}
}