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/2019-7/175837">2019-2020版物理同步鲁科选修3-1课件+练习 </a>  下一篇：<a href="/News/2019-7/175839">2019-2020版物理同步新导学案教科选修3-2课件+练习 </a> ';
}