updating database

hello,

I am trying to update database and i have got a small problem. After i press submit everything is ok but i get the page which is the one i had before the update done. I mean the database is still getting updated but on my page i see the information which is before the update.

What can i do to get the new updated page after i press submit.

here is the code

<?php

if($result1){
header("location:on.php");
}


$host="localhost"; // Host name 
$username="xxx"; // Mysql username 
$password="xxx"; // Mysql password 
$db_name="xxx"; // Database name 
$tbl_name="xxx"; // Table name 

// 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 LIMIT 0, 20";
$result=mysql_query($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>Id</strong></td>
<td align="center"><strong>Name</strong></td>
<td align="center"><strong>Lastname</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="title[]" type="text" id="title" value="<? echo $rows['title']; ?>"></td>
<td align="center"><input name="description[]" type="text" id="description" value="<? echo $rows['description']; ?>"></td>
</tr>
<?php
}
?>
<tr>
<td colspan="4" align="center"><input type="submit" name="Submit" value="Submit"></td>
</tr>
</table>
</td>
</tr>
</form>
</table>
<?php
// Check if button name "Submit" is active, do this 
if($Submit){
for($i=0;$i<$count;$i++){
$sql1="UPDATE $tbl_name SET title='$title[$i]', description='$description[$i]' WHERE id='$id[$i]'";
$result1=mysql_query($sql1);
}
}

mysql_close();
?>

PHP:

 

$result1=mysql_query($sql1);
}
if($result1){
header("location: on.php");
}
}

 

same problem, it does update but i have to refresh the page. if i do not refresh i get the old page plus i get an error now saying

Warning: Cannot modify header information - headers already sent by (output started at /home/x/public_html/x/on/on.php:32) in /home/x/public_html/x/on/on.php on line 64