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:2013课标生物配套练习B 下一篇:高考地理母题(1956-2012)汇编 考点21-40 '; }