// 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')