Opdatering af række i mysql

Kode 

<?php

$host="localhost"; // Host name 
$username=""; // Mysql username 
$password=""; // Mysql password 
$db_name=""; // Database name 
$tbl_name="bruger"; // Tabel navn

// Connect to server and select databse.
mysql_connect("$host", "$username", "$password")or die("cannot connect"); 
mysql_select_db("$db_name")or die("cannot select DB");

$sql="SELECT * FROM $tbl_name";
$result=mysql_query($sql);

// Count table rows 
$count=mysql_num_rows($result);
?>
<table width="500" border="0" cellspacing="1" cellpadding="0">
<form name="form1" method="post" action="">
<tr> 
<td>
<table width="500" border="0" cellspacing="1" cellpadding="0">


<tr>
<td align="center"><strong class="style6">Id</strong></td>
<td align="center"><strong class="style6">Brugernavn</strong></td>
<td align="center"><strong class="style6">Brugerid</strong></td>

</tr>
<?php
while($rows=mysql_fetch_array($result)){
?>
<tr>
<td align="center"><? $id[]=$rows['id']; ?><? echo $rows['id']; ?></td>
<td align="center"><input name="brugernavn[]" type="text" id="brugernavn" value="<? echo $rows['brugernavn']; ?>"></td>
<td align="center"><input name="brugerid[]" type="text" id="brugerid" value="<? echo $rows['brugerid']; ?>"></td>

</tr>
<?php
}
?>
<tr>
<td colspan="4" align="center"><input type="submit" name="Submit" value="Submit"></td>
</tr>
</table>
</td>
</tr>
</form>
</table>
<?php
// Check if button name "Submit" is active, do this 
if($Submit){
for($i=0;$i<$count;$i++){
$sql1="UPDATE $tbl_name SET brugernavn='$brugernavn[$i]', brugerid='$brugerid[$i]' WHERE id='$id[$i]'";
$result1=mysql_query($sql1);
}
}


mysql_close();
?>