function goDay(d){
	try{
		document.location.href=getPreDayUrl(document.location.href,d)
	}catch(e){}
}

function getPreDayUrl(url,tag){
	//date的parse和str.replace的正则表达式
	//要增加的时间,tag是要前后几天 
	var iToDatePlus = tag * 24 * 60 * 60 * 1000;
	
	//从url解析到时间的字符格式
	var sDate = getDateFormUrl(url);

	if(!sDate)
		return false;
	
	//要去那一天的时间秒数
	iToDate= Date.parse(sDate) + iToDatePlus;
	
	//得到时间部分的url
	sUrlDate=dateToUrl( new Date(iToDate));
	
	//替换,得到原来url的时间格式,得到想去的天数的格式
	sToUrl= '/html/'+sUrlDate+'/node_1.htm';

	return(sToUrl);

	function getDateFormUrl(url){
		var reg=/\d{4}\-\d{2}\/\d{2}/
		var regResult= url.match(reg);
		if(null != regResult){
			var sDate = regResult[0].replace('-','/');
			return sDate;
		}
		return false;
	}

	function dateToUrl(obj){
		var y=obj.getFullYear();
		var m= 1+  obj.getMonth();
		var d= obj.getDate();
		
		if(m<10)
			m='0' + '' +m;
		if(d<10)
			d='0' + '' + d;
		return y+'-'+ m + '/' + d;
	}
}


/**
 * 设置 cookie
 */
function SetCookie(name,value){	
	var argv=SetCookie.arguments;	
	var argc=SetCookie.arguments.length;	
	var expires=(2<argc)?argv[2]:null;	
	var path=(3<argc)?argv[3]:null;	
	var domain=(4<argc)?argv[4]:null;	
	var secure=(5<argc)?argv[5]:false;	
	document.cookie=name+"="+escape(value)+((expires==null)?"":("; expires="+expires.toGMTString()))+((path==null)?"":("; path="+path))+((domain==null)?"":("; domain="+domain))+((secure==true)?"; secure":"");	
}	

/**
 * 读取 cookie
 */
function GetCookie(Name) {	
	var search = Name + "=";	
	var returnvalue = "";	
	if (document.cookie.length > 0) {	
	  offset = document.cookie.indexOf(search);	
	  if (offset != -1) {		  
		offset += search.length;	
		end = document.cookie.indexOf(";", offset);							
		if (end == -1)	
			  end = document.cookie.length;	
		returnvalue=unescape(document.cookie.substring(offset,end));	
	  }	
	}	
	return returnvalue;	
}