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/2012-11/57684">如果世界上没有蚊子会怎么样？ </a>  下一篇：<a href="/News/2012-11/57686">北美淡水鱼类迅速走向灭绝：快得令人震惊 </a> ';
}