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:语文故都的秋课件沪教版第四册 下一篇:浙江省杭州市萧山九中2011届高三暑假作业 '; }