function Nethru_getCookieVal(offset)
{
	var endstr = document.cookie.indexOf (";", offset);
	
	if (endstr == -1)
		Endstr = document.cookie.length;
	
	return unescape(document.cookie.substring(offset, endstr));
}

function Nethru_SetCookie(name, value)
{
	var argv = Nethru_SetCookie.arguments;
	var argc = Nethru_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" : "");
}

function Nethru_GetCookie(name)
{
	var arg = name + "=";
	var alen = arg.length;
	var clen = document.cookie.length;
	var i = 0;

	while (i < clen) 
	{
		var j = i + alen;
		
		if (document.cookie.substring(i, j) == arg)
			return Nethru_getCookieVal (j);

		i = document.cookie.indexOf(" ", i) + 1;
		
		if (i == 0)
			break;
	}

	return null;
}

function Nethru_makePersistentCookie(name,length,path,domain)
{
	var today = new Date();
	var expiredDate = new Date(2020,1,1);
	var cookie;
	var value;

	cookie = Nethru_GetCookie(name);
	
	if ( cookie ) {		//?? ????? ??
		return 1;
	}

	var values = new Array();

	for ( i=0; i < length ; i++ ) {
		values[i] = "" + Math.random();
	}

	value = today.getTime();

	// use first decimal
	for ( i=0; i < length ; i++ ) {
		value += values[i].charAt(2);
	}

	Nethru_SetCookie(name,value,expiredDate,path,domain);
}

function Nethru_getDomain() 
{
	var _host   = document.domain;
	var so = _host.split('.');
	var dm  = so[so.length-2] + '.' + so[so.length-1];

	return (so[so.length-1].length == 2) ? so[so.length-3] + '.' + dm : dm;
}

var Nethru_domain  = Nethru_getDomain();
Nethru_makePersistentCookie("NETHRU",10,"/",Nethru_domain);