// JavaScript Document
function GetCookieVal(offset)
		//获得Cookie解码后的值
		{
		var endstr = document.cookie.indexOf (";", offset);
		if (endstr == -1)
		endstr = document.cookie.length;
		return unescape(document.cookie.substring(offset, endstr));
		}
		function GetCookie(name)
		//获得Cookie的原始值
		{
		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 GetCookieVal (j);
		i = document.cookie.indexOf(" ", i) + 1;
		if (i == 0) break;
		}
		return null;
		}
		username=GetCookie('username')