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地理一轮复习练习(新人教版必修2) 下一篇:黑龙江省哈九中08-09学年高一下学期期末考试 '; }