function showNav(){
	var TRSNav =document.getElementById("idTRSNavigator");
 	if(TRSNav!=null){
		TRSNav.style.display="none";
		var inH = TRSNav.innerHTML;
		var currNum = inH.match(/\d\,|\,\d|\,\d\,/g).toString().replace(/[\,\s]/g,'');
		//alert("当前是第"+currNum+"页");
		var toNum = inH.replace(/<(.*?)>/g,'').replace(/[\,\s]/g,'').length;
		//alert("共"+toNum+"页");

		var urlB=/\"t+(.*?)+\.htm+\"/;
		var urlA=inH.match(urlB).toString().replace(/[\"\s\,]/g,'');
		//alert(urlA.substr(1,9)+ urlA.match(/^_\d*/));
		var urlS =  urlA.substr(1,8)+urlA.match(/_[0-9]{2,}/);
		var reH="";
		//以上是字符串分析，以下是表现形式；
		if(toNum>=2){
			if(currNum==1)
				reH = "<div align=center><a href=t"+urlS+"_"+currNum+".htm><img border=\"0\" src=\"http:\/\/www.yhnews.com.cn\/images\/down-up.gif\"></a></div>";
			else if(currNum==2 && toNum>2)
				reH = "<div align=center><a href=t"+urlS+".htm><img border=\"0\" src=\"http:\/\/www.yhnews.com.cn\/images\/down-up2.gif\"></a>\&nbsp\;<a href=t"+urlS+"_2.htm><img border=\"0\" src=\"http:\/\/www.yhnews.com.cn\/images\/down-up.gif\"></a></div>";
			else if(currNum==toNum && toNum>2)
				reH = "<div align=center><a href=t"+urlS+"_"+(currNum-2)+".htm><img border=\"0\" src=\"http:\/\/www.yhnews.com.cn\/images\/down-up2.gif\"></a></div>";
			else if(currNum==toNum && toNum==2)
				reH = "<div align=center><a href=t"+urlS+".htm><img border=\"0\" src=\"http:\/\/www.yhnews.com.cn\/images\/down-up2.gif\"></a></div>";
			else
				reH = "<div align=center><a href=t"+urlS+"_"+(currNum-2)+".htm><img border=\"0\" src=\"http:\/\/www.yhnews.com.cn\/images\/down-up2.gif\"></a>\&nbsp\;<a href=t"+urlS+"_"+currNum+".htm><img border=\"0\" src=\"http:\/\/www.yhnews.com.cn\/images\/down-up.gif\"></a></div>";
		}
	return(reH);
	}
	else
	return("");
}