jsp翻页不刷新

<body bgcolor="#f7fafe" onload="loginOper();selectTU();"  onunload="unLoad();">
<form name="frmTUList" action="<%=contextPath%>/servlet/placeserviceservlet" target="frameResult" method="post">
<input type="hidden" name="actionType" value="select">
<input type="hidden" name="clickTU" value="">
<input type="hidden" name="lockTuId" value="">
<input type="hidden" name="sendType" value="">
<table width="100%" cellspacing="0" cellpadding="2" border="0">
<%
String tuFlexList = (String) session.getAttribute("placeservice.tuFlexList");
if (tuFlexList != null) {
out.println(tuFlexList);
}
PageInfoModel pageInfoModel = (PageInfoModel)session.getAttribute("placeservice.pageInfoModel");
System.out.println(pageInfoModel.getCurrentPage());
%>
<tr bgcolor="#E7EFFF"  >
                <td  colspan="8" align="center" valign="middle"><blockquote>
                   共<%=pageInfoModel.getSumPage()%>页&nbsp;&nbsp;
         <%if(pageInfoModel.getCurrentPage()<=1){%>
           上一页&nbsp;&nbsp;
         <%} else {%>
         <a href="#" onclick="javascript:return executepage('<%=request.getContextPath()%>/servlet/placeserviceservlet?actionType=getTuTree&tupage=<%=pageInfoModel.getCurrentPage()%>&pagetag=previous')">上一页</a>&nbsp;&nbsp;
         <%}%>
         <%if(pageInfoModel.getCurrentPage()>=pageInfoModel.getSumPage()){%>
           下一页&nbsp;&nbsp;
         <%} else { %>
         <a href="#" onclick="javascript:return executepage('<%=request.getContextPath()%>/servlet/placeserviceservlet?actionType=getTuTree&tupage=<%=pageInfoModel.getCurrentPage()%>&pagetag=next')">下一页</a>&nbsp;&nbsp;
         <%}%>
  当前第<%=pageInfoModel.getCurrentPage()%>页
  &nbsp;转到第<select onchange="changePage(this)">
          <% for(int i=1;i<=pageInfoModel.getSumPage();i++){
           if(pageInfoModel.getCurrentPage() == i){
          %>
           <OPTION value="<%= i%>" selected><%=i%></OPTION>
          <%}else{%>
          <OPTION value="<%= i%>"><%=i%></OPTION>
          <%}}%>
          </select>页
               </blockquote>
               </td>
       </tr>
</table>
</form>