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/2007-8/3127">物理不定项选择题解题方法与得分技巧 </a>  下一篇：<a href="/News/2007-8/3129">[化学]三招攻克化学推断题 </a> ';
}