function ajax_toggle_cover(cover_num){
         
      $('cover_td').setStyle({ height: $('main_cover').getHeight() });
      $('main_cover').hide();
	  $('main_cover_loading').show();
      
	  new Ajax.Updater(
	    'main_cover', 
		'ajax.php', 
        { method: 'get', 
          parameters: 'type=1&cover_id='+cover_num+'&'+Math.random(), 
		  onComplete: function () { 
            $('main_cover_loading').hide();
            $('main_cover').appear();
			$('cover_td').setStyle({ height: $('main_cover').getHeight() });
          } 
        }
      );
	  
   }
   
   is_ajax=0;
   						 
   /*run_ajax_toggle_showcase('1','1','2');*/
   
   function run_ajax_toggle_showcase(showcase_tab_num,showcase_old_tab_num,showcase_item_num){
      
	  if( typeof(is_showcase_int)!=='undefined' ){ showcase_int=window.clearInterval(showcase_int); }
	  
	  is_showcase_int=1;
	  showcase_int=window.setInterval("ajax_toggle_showcase("+showcase_tab_num+","+showcase_old_tab_num+","+showcase_item_num+")",15000);
      
   }
   
   function ajax_toggle_showcase(tab_num,old_tab_num,item_num){
      
	  is_ajax=1;
	  
	  if( item_num==5 ){	     
		 next_item_num =  1;
		 next_tab_num = ( tab_num==3 ) ? 1 : parseInt(tab_num)+1;	
		 next_old_tab_num = tab_num;
   	  }
	  else{	     
		 next_item_num =  parseInt(item_num)+1;
		 next_tab_num = tab_num;
		 next_old_tab_num = tab_num;
	  }
	  
	  if(tab_num==old_tab_num){
	     
         $('showcase_img').hide();
	     $('showcase_img_loading').show();
         
	     new Ajax.Updater(
	       'showcase_img', 
		   'ajax.php', 
           { method: 'get', 
             parameters: 'type=2&tab_id='+tab_num+'&old_tab_id='+old_tab_num+'&item_id='+item_num+'&'+Math.random(), 
		     onComplete: function () { 
               $('showcase_img_loading').hide();
               $('showcase_img').appear();
			   is_ajax=0;
			   /*run_ajax_toggle_showcase(next_tab_num,next_old_tab_num,next_item_num);*/
             } 
           }
         );
	     
	  }
	  else{
	     
         $('showcase').hide();
	     $('showcase_loading').show();
         
	     new Ajax.Updater(
	       'showcase', 
		   'ajax.php', 
           { method: 'get', 
             parameters: 'type=2&tab_id='+tab_num+'&old_tab_id='+old_tab_num+'&item_id='+item_num+'&'+Math.random(), 
		     onComplete: function () { 
               $('showcase_loading').hide();
               $('showcase').appear();
			   is_ajax=0;
			   /*run_ajax_toggle_showcase(next_tab_num,next_old_tab_num,next_item_num);*/
             } 
           }
         );
		 
	  }
	  
   }