求教<frameset>

main.jsp
<html>
 <head>
 </head>
  <frameset cols="8%,*">
   <frame src="bbsLeft.jsp" name="leftFrame" scrolling="no" noresize="noresize" id="leftFrame" title="leftFrame" />
    <frame src="bbsRight.jsp" name="mainFrame" id="mainFrame" title="mainFrame" />
</frameset>
<noframes>
<body>
</body>
</noframes>
</html>
————————————
left.jsp
<html>
<body>
  <div align="center">
    <c:forEach var="kind" items="${sessionScope.kindList}">
     <a href="${pageContext.request.contextPath}/BbsServlet?method=findAdmin&id=${kind.a_id}}" target="mainFrame">${kind.name}</a> <br/>
</c:forEach> </div>
</body>
</html>
——————————————
right.jsp
<html> 
  <body>
    <jsp:include page="/WEB-INF/jsps/head.jsp"></jsp:include>
   
    版主：${sessionScope.admin.name}
   
   
    <jsp:include page="/WEB-INF/jsps/foot.jsp"></jsp:include>
  </body>
————————————
为什么显示的界面是</html>