页面提交刷新问题

//--------这是html的部分
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>添加杂志</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<style type="text/css">
<!--
.unnamed1 {  font-size: 12px; color: #000000; text-decoration: none; padding-left: 9px}
-->
</style>
</head><body>
<table width="100%" border="0" cellspacing="0" cellpadding="0">
  <form action="" method="post" name="addmgz" ENCTYPE="multipart/form-data">
    <tr> 
      <td colspan="2" align="center">添加杂志</td>
    </tr>
    <tr class="unnamed1"> 
      <td width="10%" align="center">杂志名称</td>
      <td width="90%"><input type="text" name="name"></td>
    </tr>
    <tr class="unnamed1"> 
      <td width="10%" align="center">&nbsp;</td>
      <td>&nbsp;</td>
    </tr>
    <tr class="unnamed1"> 
      <td align="center">大&nbsp;类&nbsp;别</td>
      <td> 
        <select name="LType">
          <option selected>:::请选择:::</option>
  <?
   //显示 大类别
$STR="select id,LType from new_LType order by id desc";
$RST=mysql_query($STR) or die("搜索错误".$STR);
while(list($ID,$LType)=mysql_fetch_array($RST))
{
$L="<option value='$ID'>$LType</option>";
print $L;
}
  ?>
        </select>
        <input type="text" name="addLType">
        <input type="submit" name="LType_submit" value="添加大类别"></td>
    </tr>
    <tr class="unnamed1"> 
      <td align="center">&nbsp;</td>
      <td>&nbsp;</td>
    </tr>
    <tr class="unnamed1"> 
      <td align="center">小&nbsp;类&nbsp;别</td>
      <td><select name="SType">
          <option selected>:::请选择:::</option>
  <?
   //显示 小类别
$STR="select id,SType from new_SType order by id desc";
$RST=mysql_query($STR) or die("搜索错误".$STR);
while(list($ID,$SType)=mysql_fetch_array($RST))
{
$S="<option value='$ID'>$SType</option>";
print $S;
}
  ?>
        </select>
        <input type="text" name="addSType">
        <input type="submit" name="SType_submit" value="添加小类别"></td>
    </tr>
    <tr class="unnamed1"> 
      <td align="center">&nbsp;</td>
      <td>&nbsp;</td>
    </tr>
    <tr class="unnamed1"> 
      <td align="center">版&nbsp;&nbsp;&nbsp;&nbsp;本</td>
      <td><select name="ver">
          <option selected>:::请选择:::</option>
  <?
   //显示 版本号
$STR="select id,ver from new_ver order by id desc";
$RST=mysql_query($STR) or die("搜索错误".$STR);
while(list($ID,$ver)=mysql_fetch_array($RST))
{
$V="<option value='$ID'>$ver</option>";
print $V;
}
  ?>
        </select>
        <input type="text" name="addver">
        <input type="submit" name="ver_submit" value="添加版本号"></td>
    </tr>
    <tr class="unnamed1"> 
      <td align="center">&nbsp;</td>
      <td>&nbsp;</td>
    </tr>
    <tr class="unnamed1"> 
      <td align="center">期&nbsp;&nbsp;&nbsp;&nbsp;数</td>
      <td><input type="text" name="vol"></td>
    </tr>
    <tr class="unnamed1"> 
      <td align="center">&nbsp;</td>
      <td>&nbsp;</td>
    </tr>
    <tr class="unnamed1"> 
      <td align="center" valign="top">内容介绍</td>
      <td><textarea name="content" cols="50" rows="5"></textarea></td>
    </tr>
    <tr class="unnamed1"> 
      <td align="center">&nbsp;</td>
      <td>&nbsp;</td>
    </tr>
    <tr class="unnamed1"> 
      <td align="center">小&nbsp;封&nbsp;面</td>
      <td><input type="file" name="S_Cover"></td>
    </tr>
    <tr class="unnamed1"> 
      <td align="center">&nbsp;</td>
      <td>&nbsp;</td>
    </tr>
    <tr class="unnamed1"> 
      <td align="center">大&nbsp;封&nbsp;面</td>
      <td><input type="file" name="L_Cover"></td>
    </tr>
    <tr class="unnamed1"> 
      <td align="center">&nbsp;</td>
      <td>&nbsp;</td>
    </tr>
    <tr class="unnamed1"> 
      <td align="center">页&nbsp;面&nbsp;一</td>
      <td><input type="file" name="page1"></td>
    </tr>
    <tr class="unnamed1"> 
      <td align="center">&nbsp;</td>
      <td>&nbsp;</td>
    </tr>
    <tr class="unnamed1"> 
      <td align="center">页&nbsp;面&nbsp;二</td>
      <td><input type="file" name="page2"></td>
    </tr>
    <tr class="unnamed1"> 
      <td align="center">&nbsp;</td>
      <td>&nbsp;</td>
    </tr>
    <tr class="unnamed1"> 
      <td align="center">页&nbsp;面&nbsp;三</td>
      <td><input type="file" name="page3"></td>
    </tr>
    <tr class="unnamed1"> 
      <td align="center">&nbsp;</td>
      <td>&nbsp;</td>
    </tr>
    <tr class="unnamed1">
      <td align="center"><input type="submit" name="submit" value="提交"></td>
      <td><input type="submit" name="reset" value="重新填写"></td>
    </tr>
  </form>
</table>
</body>
</html>