(function($){   
    $.fn.extend({     
         yx_rotaion: function(options) {   
		    //默认参数
            var defaults = {
			     /**轮换间隔时间，单位毫秒*/
                 during:3000,
				 /**是否显示左右按钮*/
                 btn:true,
				 /**是否显示焦点按钮*/
                 focus:true,
				 /**是否显示标题*/
                 title:true,
				 /**是否自动播放*/
                 auto:true,
				 /**按钮样式命名，方便适配*/
				 css_yx_rotaion_btn:"yx-rotaion-btn",
				 css_left_btn:"left_btn",
				 css_right_btn:"right_btn",
				 css_yx_rotation_title:"yx-rotation-title",
				 css_yx_rotation_t:"yx-rotation-t",
				 css_yx_rotation_focus:"yx-rotation-focus"
            }        
            var options = $.extend(defaults, options);   
            return this.each(function(){
			    var o = options;   
				var curr_index = 0;
                var $this = $(this);				
                var $li = $this.find("li");
                var li_count = $li.length;
				$this.css({position:'relative',overflow:'hidden',width:$li.find("img").width(),height:$li.find("img").height()});
				$this.find("li").css({position:'absolute',left:0,top:0}).hide();
			    $li.first().show();
			    $this.append('<div class="' + o.css_yx_rotaion_btn +'"><span class="' + o.css_left_btn + '"><\/span><span class="' + o.css_right_btn + '"></span><\/div>');
				if(!o.btn) $("." + o.css_yx_rotaion_btn ).css({visibility:'hidden'});
                if(o.title) $this.append(' <div class="' + o.css_yx_rotation_title + '"><\/div><a href="" class="' + o.css_yx_rotation_t + '"><\/a>');
                if(o.focus) $this.append('<div class="' + o.css_yx_rotation_focus +'"><\/div>');
				var $btn = $this.find("." + o.css_yx_rotaion_btn + " span"),$title = $this.find("." + o.css_yx_rotation_t),
						   $title_bg = $this.find("." + o.css_yx_rotation_title),$focus = $this.find("." + o.css_yx_rotation_focus);
				//如果自动播放，设置定时器
				if(o.auto) var t = setInterval(function(){$btn.last().click()},o.during);
                $title.text($li.first().find("img").attr("alt"));	
				$title.attr("href",$li.first().find("a").attr("href"));				
				
               // 输出焦点按钮
               for(i=1;i<=li_count;i++){
                 $focus.append('<span>'+i+'</span>');
               }
               // 兼容IE6透明图片   
               if($.browser.msie && $.browser.version == "6.0" ){
                  $btn.add($focus.children("span")).css({backgroundImage:'url(images/ico.gif)'});
               }		
               var $f = $focus.children("span");
               $f.first().addClass("hover");
               // 鼠标覆盖左右按钮设置透明度
               $btn.hover(function(){
	              $(this).addClass("hover");
               },function(){
	              $(this).removeClass("hover");
               });
			   //鼠标覆盖元素，清除计时器
               $btn.add($li).add($f).hover(function(){
                if(t) clearInterval(t);
               },function(){
                if(o.auto) t = setInterval(function(){$btn.last().click()},o.during);
               });
			   //鼠标覆盖焦点按钮效果
               $f.bind("mouseover",function(){
	             var i = $(this).index();
	             $(this).addClass("hover");
	             $focus.children("span").not($(this)).removeClass("hover");
	             $li.eq(i).fadeIn(300);
                 $li.not($li.eq(i)).fadeOut(300);	
	             $title.text($li.eq(i).find("img").attr("alt"));
	             curr_index = i;
               });
			   //鼠标点击左右按钮效果
               $btn.bind("click",function(){
                 $(this).index() == 1?curr_index++:curr_index--;
	             if(curr_index >= li_count) curr_index = 0;
	             if(curr_index < 0) curr_index = li_count-1;
                 $li.eq(curr_index).fadeIn(300);
	             $li.not($li.eq(curr_index)).fadeOut(300);	
	             $f.eq(curr_index).addClass("hover");
	             $f.not($f.eq(curr_index)).removeClass("hover");
	             $title.text($li.eq(curr_index).find("img").attr("alt"));
				 $title.attr("href",$li.eq(curr_index).find("a").attr("href"));	
               });
 
            });   
        }   
    });   
       
})(jQuery);