新手简单的PHP分页有关问题，但是不知道为什么不分页

新手简单的PHP分页问题，但是不知道为什么不分页？

PHP code

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<?
function pager($rows,$page_size){ 
global $page,$select_from,$select_limit,$pagenav; 
$page_count = ceil($rows/$page_size); 
if($page <= 1 || $page == '') $page = 1; 
if($page >= $page_count) $page = $page_count; 
$select_limit = $page_size; 
$select_from = ($page - 1) * $page_size.','; 
$pre_page = ($page == 1)? 1 : $page - 1; 
$next_page= ($page == $page_count)? $page_count : $page + 1 ; 
$pagenav .= "第 $page/$page_count 页 共 $rows 条记录 "; 
$pagenav .= "<a href='?page=1'>首页</a> "; 
$pagenav .= "<a href='?page=$pre_page'>前一页</a> "; 
$pagenav .= "<a href='?page=$next_page'>后一页</a> "; 
$pagenav .= "<a href='?page=$page_count'>末页</a>"; 
$pagenav.="　跳到<select name='topage' size='1' onchange='window.location=\"?page=\"+this.value'>\n"; 
for($i=1;$i<=$page_count;$i++){ 
if($i==$page) $pagenav.="<option value='$i' selected>$i</option>\n"; 
else $pagenav.="<option value='$i'>$i</option>\n"; 
} 
} 

 include("conn.php");

///////////////////////////// 利用pager函数计算出 $select_from 从哪条记录开始检索、$pagenav 输出分页导航 
$rows = mysql_num_rows(mysql_query("select * from manager")); 
echo $rows;
pager($rows,2); 
$sql = "select * from manager limit $select_from $select_limit"; 
echo $sql;
$rst = mysql_query($sql); 

while($row=mysql_fetch_array($rst)){
?>
        <tr bgcolor="#FFFFFF" onMouseOver="javascript:this.bgColor='#D9FA9C'" onMouseOut="javascript:this.bgColor='#FFFFFF'" style="CurSoR:hand;">
          <td align="center" ><input type="checkbox" name="SelectItem" value=""></td>
          <td align="left" ><?=$row[chinaname]?></td>
          <td align="left" ><?=$row[username]?></td>
          <td align="left"><?=$row[Purview]?></td>
          <td align="left"><?=$row[password]?></td>
          <td align="center" ><?=$row[Tel]?></td>
          <td align="center"><?=$row[FAX]?></td>
          <td align="center"><?=$row[Mobile]?></td>
          <td align="center" ><?
            if ($row[sfxs]==0){
             echo "显示";
            }else{
             echo "隐藏";
            } 
          ?></td>
          <td align="center" ><?
            if ($row[sfjy]==0){
             echo "禁用";
            }else{
             echo "启用";
            } 
          ?></td>
          <td ><?=$row[Adddate]?></td>
        </tr>
  <?
  }
  echo $pagenav;
  ?>

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