ction autoRolling(){ thumbnailContent = $('#simpleSkin06_9 .thumbnail li:eq(' + numChk + ')').html(); $('#simpleSkin06_9 .imageBig').html(thumbnailContent); $('#simpleSkin06_9 .thumbnail li a').removeClass('on'); $('#simpleSkin06_9 .thumbnail li:eq(' + numChk + ') a').addClass('on'); if(numChk < galleryLength - 1){ numChk++; }else{ numChk = 0; } }; var timer = setInterval(autoRolling,3000); })(jQuery)