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/2009-7/13228">物理：光的直线传播及波动规律突破 </a>  下一篇：<a href="/News/2009-7/13230">新人教版《物质结构与性质》精讲精析精练 </a> ';
}