[HELP] File_exists() funtion

[PokeTech]

Well I'm trying to get this code working, but I'm having no luck what so ever... I'm trying to get it to display if the file is used (exists) or doesnt exist. Its a page with a form, then the username is the name of the page so $name.php, and then it creates it in a directory but I want to make it say File (username) exists please choose a different username.

 

Here's the code if you want to try and fix it:

 

<?
$center="<br><center>";
$ecenter="</center>";
$header="";
$bottom="";
if(isset($name, $gamename, $contact, $code1, $code2, $code3, $country, $card, $bio)) {
$fp = fopen("/home/www/poketech.net/site/wi-fi/users/$name.php","a");
$filename="../users/$name.php";
?>
<?
if (file_exists($filename)) {
    echo "<br><center>Username Already excists, Please choose a different one</center>";
} else {
    echo "<br><center>Your page is here: <a href=/site/wi-fi/users/$name.php>http://poketech.net/site/wi-fi/users/$name.php</a></center>";
}
?>
<? @ReadFile("url.php") ?>
<?
fputs($fp,($header).'<?PHPinclude("/home/www/poketech.freehostia.com/top.php");?>');
fputs($fp,nl2br($center).'<table border="1"><tr><td>Username:</td><td>');
fputs($fp,nl2br($name).'</td></tr><tr><td>Game Name:</td><td>');
fputs($fp,nl2br($gamename).'</td></tr><tr><td>Contact:</td><td>');
fputs($fp,nl2br($contact).'</td></tr><tr><td>Friend Code:</td><td>');
fputs($fp,nl2br($code1).'-');
fputs($fp,nl2br($code2).'-');
fputs($fp,nl2br($code3).'</td></tr><tr><td>Country:</td><td>');
fputs($fp,nl2br($country).'</td></tr><tr><td>Trainer Card:</td><td><img src="');
fputs($fp,nl2br($card).'"></td></tr><tr><td>Bio:</td><td>');
fputs($fp,nl2br($bio).'</td></tr></table>');
fputs($fp,nl2br($ecenter).'');
fputs($fp,($bottom).'<?PHP
include("/home/www/poketech.freehostia.com/bottom.php");?>');
fclose($fp);
} 
?>



<form action="<?="$PHP_SELF#results"?>" method="POST">
<table align="center" width="50%" border="0" class="style1" style="margin-bottom:100px;">
<tr>
  <td valign="top">Username:</td>
  <td><input name="name" type="text" size="30" maxlength="30" title="Username"/></td>
</tr>
<tr>
  <td valign="top">Game Name:</td>
  <td><input name="gamename" type="text" size="30" maxlength="30" title="Game Name"/></td>
</tr>
<tr>
  <td></td><td valign="top">
</tr>
<tr>
  <td valign="top">E-Mail:</td>
  <td><input name="contact" type="text" size="30" maxlength="35" title="E-Mail"/></td>
</tr>
<tr>
  <td valign="top">Friend Code:</td>
  <td>
  <input name="code1" type="text" size="4" maxlength="4"/> <input name="code2" type="text" size="4" maxlength="4" /> <input name="code3" type="text"   size="4" maxlength="4"/></td>
</tr>
<tr>
  <td valign="top">Country:</td>
  <td><input name="country" type="text" size="30" maxlength="100"/></td>
</tr>
<tr>
<tr>
  <td valign="top">Card:</td>
  <td><input name="card" type="text" size="30" maxlength="9999"/></td>
</tr>
<tr>
  <td valign="top">Bio:</td>
  <td><textarea cols=40 rows=5 name=bio wrap=virtual></textarea></td>
</tr>
<tr>
  <td colspan=2 align=center>
<input type=submit value=" Submit ">
<input type="reset" name="Reset" value="Reset" >
  <td>
</tr>
</table>
</form>

 

If anyone could help in fixing this that would be great, cause I've tried as many ways as I can think and now I'm stuck... So please help!

[PokeTech]

Anyone?