模态窗口post时不打开新窗口

模态窗口的新增代码 
  <script> 
  window.name   =   "myname"; 
  </script> 
  
模态窗口的部分代码——增加表单的target属性 
          <form   name="form1"   method="post"   action="insert.asp?up"   target="mywin"> 
                              <table   width="100%"   border="0"> 
                                  <tr>   
                                      <td>   <div   align="right"> 
                                              <input   type="file"   name="file1"   size="27"> 
                                          </div></td> 
                                  </tr> 
                                  <tr>   
                                      <td><div   align="center">   
                                          <input   type="submit"   name="Submit"   value="文件上传"> 
                                          </div></td> 
                                  </tr> 
                              </table> 
                          </form>