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/2020-1/181550">2020化学材同步导学提分教程人教选修四讲义+测试 </a>  下一篇：<a href="/News/2020-1/181552">2020化学同步导学提分教程苏教选修五讲义+测试 </a> ';
}