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:2012高一英语备课资料:Unit 4 Astronomy:the science of the stars(新人教版必修3) 下一篇:2012高一英语音频素材:Unit 3 The Million Pound Bank Note 1(新人教版必修3) '; }