如何给搜索结果加链接？

如何给下面的搜索结果加链接啊？
search.php
<?php
    $type=$_POST[type];
$content=$_POST[content];
$task_subject=$_POST[task_subject];
$task_no=$_POST[task_no];
$sql=mysql_query("select * from rco_task where (task_subject like'%$content%' or task_no like'%$content%')");
$info=mysql_fetch_array($sql);
?>
<?php
if($info){
do{
   ?>
                  <table width="540" border="0" cellspacing="0" cellpadding="0">
                    <tr>
                      <td height="26"><?php echo str_ireplace($content,"<font color='#FF0000'>".$content."</font>",$info[task_subject]);?>&nbsp;&nbsp;<?php echo str_ireplace($content,"<font color='#FF0000'>".$content."</font>",$info[task_no]);?></td>
                    </tr>
                    <tr>
                    </tr>
                    <tr>
                      <td height="26">&nbsp;任务标题：<?php echo str_ireplace($content,"<font color='#FF0000'>".$content."</font>",$info[task_subject]);?>&nbsp;&nbsp;&nbsp;任务编号：<?php echo str_ireplace($content,"<font color='#FF0000'>".$content."</font>",$info[task_no]);?></td>
                    </tr>
                  </table>
                  
                  <?php
} while($info=mysql_fetch_array($sql));
 }else{
 ?>
<table width="540" border="0" cellspacing="0" cellpadding="0">
                    <tr>
                      <td align="center">您检索的信息资源不存在！</td>
                    </tr>
                  </table>
<?php
}
  ?>