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:2010届历史一轮复习教案(新人教) 下一篇:【热烈祝贺】高考资源网会员校考生勇夺桂冠! '; }