function chkdiv(divid){ var chkid=document.getElementById(divid); if(chkid != null){return true; } else {return false; } } if (chkdiv('fy')){ document.getElementById('fy').innerHTML='上一篇:[原创]2011高考数学知识点精华帖 下一篇:[原创]2011届高考数学热点选择填空题精炼 '; }