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/2010-3/23188">物理：氢原子光谱课件 </a>  下一篇：<a href="/News/2010-3/23191">各版本《蜀道难》学案汇编 </a> ';
}