为什么我的分页不能正常分页啊

<?php
include_once("inc/auth.inc.php");
include_once("inc/utility_all.php");
$HTML_PAGE_TITLE = ("测试专用");
include_once("inc/header.inc.php");
$query = "SELECT * from USER where USER_ID='admin'";
$cursor= exequery(TD::conn(),$query);
/*
exequery 是OA系统inc/conn.php包装的SQL语句执行函数，TD::conn()是数据库的连接标识符
*/
if($ROW=MySQL_fetch_array($cursor))
$DEPT_ID=$ROW["DEPT_ID"];
$con = mysql_connect ("localhost:3336","root","myoa888");
if (!$con)
{
die ('建立连接失败:' .mysql_error());
}
mysql_select_db ("TD_OA",$con);
mysql_query('set names gbk');
$Page_size=2;
$result=mysql_query('select * from file_content');
$count = mysql_num_rows($result);
$page_count = ceil($count/$Page_size);
$init=1;
$page_len=7;
$max_p=$page_count;
$pages=$page_count;
//判断当前页码
if(empty($_GET['page'])||$_GET['page']<0){
$page=1;
}else {
$page=$_GET['page'];
}
$offset=$Page_size*($page-1);
$result = mysql_query("SELECT file_content.* FROM file_content,file_sort WHERE file_content.SORT_ID !=0 and file_sort.SORT_ID=file_content.SORT_ID and file_sort.SORT_TYPE=5 order by SEND_TIME DESC limit 50");
echo "<center> <table border='2' align='center' width='800' height='100%' style='overflow-x: auto; overflow-y: auto; '><tr height='30' ><td align='center'> 序号</td><td align='center'>文件名称</td><td width='150' align='center'> 上传时间</td></tr>";
$Num=1;
while($row = mysql_fetch_array($result))
{
echo "<tr height='30' >";
echo "<td align='center'>".$Num."</td>";
echo "<td >";
echo '<a href="/general/file_folder/read.php?SORT_ID='.$row['SORT_ID'].'&CONTENT_ID='.$row['CONTENT_ID'].'&FILE_SORT=1&start=0" target="_blank" >'.' '.$row['SUBJECT'].'</a>';
echo "</td>";
echo "<td align='center'>".$row['SEND_TIME']."</td>";
echo "</tr>";
$Num++;
}
echo " </table></center>";
$page_len = ($page_len%2)?$page_len:$pagelen+1;//页码个数
$pageoffset = ($page_len-1)/2;//页码个数左右偏移量
$key='<div class="page">';
$key.="<span>$page/$pages</span>&nbsp;";//第几页,共几页
if($page!=1){
$key.="<a href=\"".$_SERVER['PHP_SELF']."?page=1\">第一页</a> ";//第一页
$key.="<a href=\"".$_SERVER['PHP_SELF']."?page=".($page-1)."\">上一页</a>";//上一页
}else {
$key.="第一页 ";//第一页
$key.="上一页";//上一页
}
if($pages>$page_len){
//如果当前页小于等于左偏移
if($page<=$pageoffset){
$init=1;
$max_p = $page_len;
}else{//如果当前页大于左偏移
//如果当前页码右偏移超出最大分页数
if($page+$pageoffset>=$pages+1){
$init = $pages-$page_len+1;
}else{
//左右偏移都存在时的计算
$init = $page-$pageoffset;
$max_p = $page+$pageoffset;
}
}
}
for($i=$init;$i<=$max_p;$i++){
if($i==$page){
$key.=' <span>'.$i.'</span>';
} else {
$key.=" <a href=\"".$_SERVER['PHP_SELF']."?page=".$i."\">".$i."</a>";
}
}
if($page!=$pages){
$key.=" <a href=\"".$_SERVER['PHP_SELF']."?page=".($page+1)."\">下一页</a> ";//下一页
$key.="<a href=\"".$_SERVER['PHP_SELF']."?page={$pages}\">最后一页</a>";//最后一页
}else {
$key.="下一页 ";//下一页
$key.="最后一页";//最后一页
}
$key.='</div>';
?>