//获得Cookie解码后的值
function GetCookieVal(v_offset)
{
	var endstr = document.cookie.indexOf (";", v_offset);
	if (endstr == -1)
		endstr = document.cookie.length;

	return unescape(document.cookie.substring(v_offset, endstr));
}

//设定Cookie值
function SetCookie(v_name, v_value)
{
	var expdate = new Date("January 1, 2037");
	var argv = SetCookie.arguments;
	var argc = SetCookie.arguments.length;
	var expires = (argc > 2) ? argv[2] : null;
	var path = (argc > 3) ? argv[3] : "/";
	var domain = (argc > 4) ? argv[4] : "sdo.com";
	var secure = (argc > 5) ? argv[5] : false;

	//if(expires!=null) expdate.setTime(expdate.getTime() + ( expires * 1000 ));

	document.cookie = v_name + "=" + escape (v_value) +"; expires="+ expdate.toGMTString()
	+((path == null) ? "" : ("; path=" + path)) +((domain == null) ? "" : ("; domain=" + domain))
	+((secure == true) ? "; secure" : "");
}

//删除Cookie
function DelCookie(v_name)
{
	var exp = new Date();
	exp.setTime (exp.getTime() - 1);
	var cval = GetCookie (v_name);

	document.cookie = v_name + "=" + cval + "; expires="+ exp.toGMTString();
}

//获得Cookie的原始值
/*
function GetCookie(v_name)
{
	var arg = (v_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)
		{
			//alert(j);
			return GetCookieVal (j);
		}

		i = document.cookie.indexOf(" ", i) + 1;
		if (i == 0)
			break;
	}
	
	return null;
}
*/
function GetCookie(v_name)
{
	var lowerCookieName = v_name.toLowerCase();
	var cookieStr = document.cookie;
	
	if (cookieStr == "")
			return "";
	
	var cookieArr = cookieStr.split("; ");
	var pos = -1;
	for (var i=0; i<cookieArr.length; i++)
	{
		//alert(cookieArr[i]);
		pos = cookieArr[i].indexOf("=");
		if (pos > 0)
		{
				if (cookieArr[i].substring(0, pos).toLowerCase() == lowerCookieName)
				{
						return unescape(cookieArr[i].substring(pos+1, cookieArr[i].length));
				}
		}
	}
	
	return "";
}