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/2018-8/165681">2018-2019学年高中物理选修3-1沪科版课件 </a>  下一篇：<a href="/News/2018-8/165683">2018-2019版生物新学案同步必修三北师大版课件+讲义 </a> ';
}