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/2012-10/55418">学习高二生物的几点好方法2 </a>  下一篇：<a href="/News/2012-10/55420">生物考试拿高分先从吃透课本做起 </a> ';
}