求助，是否能帮忙看看什么错误。。。。

<?php 
function get_client_ip() 
{
global $_SERVER;
if (isset($_SERVER["HTTP_X_FORWARDED_FOR"])) 
{
$realip = $_SERVER["HTTP_X_FORWARDED_FOR"];
}
elseif (isset($_SERVER["HTTP_CLIENT_IP"])) 
{
$realip = $_SERVER["HTTP_CLIENT_IP"];
}
else 
{
$realip = $_SERVER["REMOTE_ADDR"];
}
return $realip;
}
require_once("conn.php");
$sql='update H_Sys set sys_count=sys_count+1';
$conn->Execute($sql);
$sql='select * from H_Sys';
$rs = $conn->Execute($sql);
$visiter_num= $rs->Fields['sys_count']->Value;
$sql='delete from H_Online where ('.time().'-online_time)>(20*60)';
$conn->Execute($sql);
$sql="insert into H_Online(online_ip,online_time) values('".get_client_ip()."',".time().")";
$conn->Execute($sql);
$sql='select count(*) as online_count from H_Online';
$rs = $conn->Execute($sql);
$online_count=$rs->Fields['online_count']->Value;
?>
<html>
<LINK href="images/font.css" type=text/css rel=stylesheet>
<BODY bgColor=#ffffff leftMargin=0 background=images/main_bg.gif topMargin=0>
<table cellSpacing=0 cellPadding=0 width=760 align=center bgColor=#de926b border=0><tr><td>
<?php require("top.php"); ?>
<?php require("newest.php"); ?>
</td></tr></table>
<TABLE height=25 cellSpacing=0 cellPadding=0 width=760 align=center border=0>
<TBODY>
<TR>
<TD bgColor=#003366 height=30>
</TD></TR></TBODY></TABLE></body>
</html>