//圖片播放物件
  // property : iid
  // method : play() , stop() , first() , next() , previous()
  function play_img(filelist,title_list,img_control,txt_control){
	 var url_arr = filelist.split(',');
	 var title_arr = title_list.split('>,<');
	 iid : null;	 
	 // 播放
     this.play = function (){
        this.iid = window.setInterval("show_image('" + filelist + "','" + title_list + "','" + img_control + "','" + txt_control + "');",4000)	    
	 }
	 // 停止
	 this.stop = function (){
	    clearInterval(this.iid)
	 }  
	 // 第一張
	 this.first = function (){
        document.getElementById(img_control).src = url_arr[0];
        document.getElementById(txt_control).innerHTML = title_arr[0];	    
	 }
	 // 下一張
	 this.next = function (){
		var flag = false;
	    var this_url = document.getElementById(img_control).src
	    clearInterval(this.iid);
	    for (i = 0;i <= url_arr.length - 1 ;i++ ){
			if (flag == true){
                document.getElementById(img_control).src = url_arr[i];
                document.getElementById(txt_control).innerHTML = title_arr[i];	
				flag = false;
				i = url_arr.length - 1;
			}
			if (this_url == url_arr[i]){
			   flag = true;
			}
	    }
	 }
	 // 上一張
	 this.previous = function (){
	    var this_url = document.getElementById(img_control).src
	    clearInterval(this.iid);
	    for (i = 0;i <= url_arr.length - 1 ;i++ ){
			if (this_url == url_arr[i]){
				if (i != 0){
                   document.getElementById(img_control).src = url_arr[i - 1];
                   document.getElementById(txt_control).innerHTML = title_arr[i - 1];
				}
			}
	    }		
	 }
	 // 最後一張
	 this.last = function (){
        document.getElementById(img_control).src = url_arr[url_arr.length - 1];
        document.getElementById(txt_control).innerHTML = title_arr[url_arr.length - 1];	   
	 }
  }

  // 輪播動作
  function show_image(filelist,title_list,img_control,txt_control){

     var file = document.getElementById(img_control).src
     var arr = filelist.split(',');
	 var arr2 = title_list.split('>,<');
	 var j = false 
	 // 如果已經最後一張,重頭開始播
	 if (arr[arr.length - 1] == file){
		     document.getElementById(img_control).src = arr[0];
			 document.getElementById(txt_control).innerHTML = arr2[0];	   
	 } else {	 
	    for (i = 0;i <= arr.length - 1;i++ ){
	        if (j == true){
		        document.getElementById(img_control).src = arr[i];
	  	   	    document.getElementById(txt_control).innerHTML = arr2[i];
		        j = false;
			    i = arr.length;
	         };

	        if (arr[i] == file){
		        j = true;         
            };
	    }	 
	 }
  }