PHP+MYSQL数据库查询的问题（急）

<?
function getmicrotime(){ 
list($usec, $sec) = explode(" ",microtime()); 
return ((float)$usec + (float)$sec); 
}
 $time_start=getmicrotime();
 require("class/connect.php");
 include("class/db_sql.php");
 $link=db_connect();
 $it86=new mysqlquery();
?> 
<table width="100%" border="0" cellspacing="0" cellpadding="3">
<?
  $scource=$it86->query("select newsid,newstitle,newsdate from news where news.newspage=1 and isallow=1 and isdelete=0 order by newsid desc limit 20");
  while ($rs=$it86->fetch($scource)){
?>
                  <tr> 
                    <td width="6%" class="underline"><img src="image/soft-3.gif" width="15" height="9"></td>
                    <td width="10%" nowrap class="underline"><a href="news/newssubcate.php?smallcateid=<?=$rs['smallcateid']?>" target="_blank">[<?=$rs['smallcatename']?>]</a></td>
                    <td width="65%" class="underline"><a href="news/readnews.php?newsid=<?=$rs['newsid']?>" title="<?=$rs['newstitle']?>" target="_blank"><?=$rs['newstitle']?></a></td>
                    <td width="19%" nowrap class="underline"><?=$rs['newsdate']?></td>
                  </tr>
<?
   }
?>
                  <tr> 
                    <td colspan="4"><div align="right"><a href="news/newssubcate.php?bigcateid=<?=$bigcateid?>"><img src="image/more.jpg" width="58" height="15" border="0"></a></div></td>
                  </tr>
</table>   
<?
 $time_end=getmicrotime();
 $c_time=$time_end-$time_start;
 echo("TIME:".$c_time);
 db_close();
 $it86=NULL;
?>