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/2011-7/37691">写给准高三生：如何提高物理成绩 </a>  下一篇：<a href="/News/2011-7/37693">语文：人教新课标版必修3 同步练习 </a> ';
}