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：<a href="/News/2010-3/23211">《用样本是数字特征估计总体的数字特征》教案汇编 </a>  下一篇：<a href="/News/2010-3/23213">高考英语阅读表达预测试题 </a> ';
}