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/2018-1/155267">2017-2018学年高中物理鲁科版选修3-3素材：第5章热力学定律 </a>  下一篇：<a href="/News/2018-1/155269">【优选整合】人教A版高中数学选修1-1 </a> ';
}