Newbie 2

Notice: Undefined variable: username in /home/fhlinux169/c/
clashoff.co.uk/user/htdocs/create_entry.php on line 11

Notice: Undefined variable: password in /home/fhlinux169/c/
clashoff.co.uk/user/htdocs/create_entry.php on line 11

Ive got a new error message please help.Am trying to setup userlogin
on my website.

This is the code:

<?php

mysql_connect("localhost","root") or
die ("Could not connect to database");
mysql_select_db("user") or
dir ("Could not select database");

if ($_POST['submit'] == "Register")
{
$query = "insert into users
(username, password) values ('$username', '$password')";
mysql_query($query) or
die (mysql_error());
?>
<h3>You are now registered</h3>
<a href="index.html">Go back to main page</a>
<?php
}
else
{
print("not registered");
}
?>

.

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