function mm_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 mm_SetCookie(name, value)
			//设定Cookie值
			{
			var expdate = new Date();
			var argv = mm_SetCookie.arguments;
			var argc = mm_SetCookie.arguments.length;
			var expires = (argc > 2) ? argv[2] : null;
			var path = (argc > 3) ? argv[3] : null;
			var domain = (argc > 4) ? argv[4] : null;
			var secure = (argc > 5) ? argv[5] : false;
			if(expires!=null) expdate.setTime(expdate.getTime() + ( expires * 1000 ));
			document.cookie = name + "=" + escape (value) +((expires == null) ? "" : ("; expires="+ expdate.toGMTString()))
			+((path == null) ? "" : ("; path=" + path)) +((domain == null) ? "" : ("; domain=" + domain))
			+((secure == true) ? "; secure" : "");
			}
			function mm_DelCookie(name)
			//删除Cookie
			{
			var exp = new Date();
			exp.setTime (exp.getTime() - 1);
			var cval = mm_GetCookie(name);
			document.cookie = name + "=" + cval + "; expires="+ exp.toGMTString();
			}
			function mm_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 mm_GetCookieVal(j);
			i = document.cookie.indexOf(" ", i) + 1;
			if (i == 0) break;
			}
			return null;
			}