I have this header information error while I was playing with a script.

Warning: Cannot modify header information - headers already sent by (output started at /home/user/public_html/layouts/connection.php:8) in /home/user/public_html/layouts/addcomments.php on line 23

I wanted the page to redirect itself after submitting the comment, but I messed up.
I also want to know how do I make the url text area capible of accepting urls and emails.
addcomments.php
[PHP]<?php
include('connection.php');
$action = strip_tags($_GET["action"]);
$id = strip_tags($_GET["id"]);

if ($action=="add")
{
$name = strip_tags($_POST["name"]);
$entry = strip_tags($_POST["entry"]);
$email = strip_tags($_POST["email"]);

// add comments
if (empty($name) || empty($entry))
{
die ("Error, you cannot submit a blank entry.");
}

$q = "insert into layout_comments (id, name, email, date, layout_id, entry) VALUES

('','$name','$email',now(),'$id','$entry')";
$result= mysql_query($q) or die
("Could not execute query : $q." . mysql_error());
if ($result)
{
header('Location: addcomments.php');

}

}
else {


?><form action="<?php echo "addcomments.php?action=add&id='$id' "; ?>" method="post">
<table width="130" border="0" cellspacing="1" cellpadding="0">
<tr>
<td height="23" colspan="2"><b>Add Comments</b></td>
</tr>
<tr>
<td>Name</td>
<td>
<input type="text" name="name" size="30">
</td>
</tr>
<tr>
<td height="25">Url:</td>
<td height="25">
<input type="text" name="email" size="30">
</td>
</tr>
<tr>
<td height="25">Comments</td>
<td height="25">
<textarea name="entry" cols="30" rows="5"></textarea>
</td>
</tr>
<tr><td colspan=2><input type="submit" value="submit"></td></tr>
</table></form>
<?php
}
?>
<?
$id = strip_tags($_GET["id"]);

$q = "SELECT * from layout_comments where layout_id='$id' order by date desc ";
$result= mysql_query($q) or die
("Could not execute query : $q." . mysql_error());


while ($row=mysql_fetch_array($result))
{
$id=$row["id"];
$name=$row["name"];
$email=$row["email"];
$entry=$row["entry"];
$date=$row["date"];
$layout_id = $row["layout_id"];

?>

<table width="80%" border="0" cellspacing="1" cellpadding="0" align="center">
<tr>
<td>Comments for <?php echo "$title"; ?></td>
</tr>
<tr>
<td>
<?php echo "$entry"; ?>
<p>Posted by <a href="<?php echo "$email"; ?>"><?php echo "$name"; ?></a> on <?php

echo "$date"; ?>.</p>
</td>
</tr>
</table>

<?php
}


?>[/PHP]

In a quick glance at your code, it does not appear that your are outputting anything before you attempt the header() function. So, my guess is either:

1. connection.php is outputting something using echo(), print(), etc.
2. You have whitespace before or after the initial and final <?PHP ?> tags in the connection.php include file.

I do not understand what you are asking here: It will accept a URL or email address---anything your user can type on the keyboard can be typed into that text input.