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/2007-10/4186">数学新人教选修4-5 </a>  下一篇：<a href="/News/2007-10/4188">英语牛津必修模块2 </a> ';
}