jquery的一个问题

这个是我的前台
<script>
       var id=0;            
       function addressAction(){
         $.post(
           './upload/progress.action',
           function(data){
           
             if(data.currentItem==0){
               $("#m").text('0%');
             }else if(data.state.rate!=100){
               $("#m").text(data.state.readedBytes+'/'+data.state.totalBytes+':'+data.state.rate+'%');
             }else if(data.state.rate==100){             
               $("#m").text(data.state.readedBytes+'/'+data.state.totalBytes+':'+'100% 上传完成!');              
               window.clearInterval(id);
                $("#m").text('正在写入数据库，请稍等');
             }
             $("#img").html("");             
             var num=data.state.rate/10;
             
             for(var i=1;i<=num;i++){
               $("#img").append("<img src='./images/grid.gif' />");
             }
             for(var j=1;j<=10-num;j++){
               $("#img").append("<img src='./images/gray.gif' />");
             }
           },
           'json'          
          );
       }
       
       
       function read(){
        alert('123456');
       }
       
       
       
        function uploadAction(){
         $.post(
           './upload/upload.action',
           function(data){
          alert('324234');
           },
           'json'
          );
       }
       
       function submitForm(){
         if($("#f1").val()==""){
           alert('上传文件为空!!!');
           return ;
         }
         id=window.setInterval(addressAction,1000); 
         
          //uploadAction();
          
         $("form:first").submit();/*提交第一个表单*/       
       }
    </script>
  </head>
  
  <body>
    <form action="upload/upload.action" method="post" enctype="multipart/form-data">
       File:<input type="file" name="file" id="f1" />
       <br/>
       <span id="m"></span><br/>
       <span id="img"></span>
       <br/>
       <input type="button" onclick="submitForm()" value="上传"  />
    </form>   
我是传递到strust2里面进行处理的  <constant name="struts.multipart.maxSize" value="500000000000000" />
  <package name="upload" namespace="/upload" extends="json-default">  
    <!-- 查询上传进度 -->
    <action name="progress" class="action.FileProgressAction">
       <result name="success" type="json"></result>
    </action>
    
    <!-- 上传文件 -->
    <action name="upload" class="action.FileProgressUploadAction">
      <result name="success" type="chain">read</result>
    </action>
    
    <!-- 写入数据库 -->
    <action name="read" class="action.ReadFileAction">
      <result name="success" type="json"></result>
    </action>
  </package>我的问题是每次都会出现一个下载json的东西 我想出去json的值 然后显示在id为m的div里面进行显示，我不想要跳转