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/2010-9/29811">备战2011生物教学必备 </a>  下一篇：<a href="/News/2010-9/29813">2011高三地理一轮复习资料 </a> ';
}