PHP test...?

meta
1 
 <meta name = Chen Baiwan.tk is responsible for the production of animations like Cereal and games like Shoot Kim Jong-il and Shoot Trent Lott. We also have humor, comics and cartoons.>
<?php
include "header.php";
$id = $HTTP_GET_VARS["id"];
$extension = "html";
if (!$id || $id==undefined)
{
?>
<body topmargin="0" leftmargin="0">


<body topmargin="0" leftmargin="0" background="chinesewoodgrain.jpg">


<center><table width=100% height=100%><tr><td background="chinesewoodgrain.jpg" width="100%" height="100%" valign="middle" align="center"><embed src="intro.swf" height=250 width=350></td></tr></table></center>
}</table>
<body background="chinesewoodgrain.jpg">
<?php
}
else if ( file_exists("$id.$extension" ) )
{
include "topmenu.php";
?>
 <p align="center">
    <td width="200" height="487" bgcolor="#FFFFFF">
    <p align="center">
<?php
include "info.html";
?>
</td>
    <td width="500" height="487" bgcolor="#FFFFFF">
    <p align="center">
<?php
include "$id.$extension"; ?>
?>
</td></tr></table>
<?php
}
else
{
include "topmenu.php";
?>
 <p align="center">
    <td width="200" height="487" bgcolor="#FFFFFF">
    <p align="center">
<?php
include "info.html";
?>
</td>
    <td width="500" height="487" bgcolor="#FFFFFF">
    <p align="center">
<?php
include "nonexist.php"; 
?>
</td></tr></table>
</body></html>