相册图片幻灯片功能性相册

if(!enableshow) return;
					enableshow = false;
					if(nav == 1){
						//reached the first one
						if(current==0){
							enableshow = true;
							return;
						}
						var $content 			= $('#pp_thumbContainer div.album:nth-child('+parseInt(album+1)+')')
												  .find('.content:nth-child('+parseInt(current)+')');
						//reached the last one
						if($content.length==0){
							enableshow = true;
							current-=2;
							return;
						}	
					}