Warning: mysql_fetch_array(): supplied argument is not a valid MySQL result resource

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PHP

Hi there iv been having problems with mysqli so i have resorted back to mysql and im having problems with mysql_fetch_arrey ( $results ) i keep getting the error message

Warning: mysql_fetch_array(): supplied argument is not a valid MySQL result resource in /home/a8834432/public_html/secure/index.php on line 11

and line 11 is

while($row = mysql_fetch_array( $result )) {

here is a copy of the full script
i am using the include dbc.php to connect to mysql and that all works fine

<?php
include 'dbc.php';   // As functions.php is not included
//$mysql = new mysql(HOST, USER, PASSWORD, DATABASE);
//mysqli_select_db($DATABASE)or die("cannot select DB");
$usr = $_POST['user'];
$pas = $_POST['pass'];

$sql = "SELECT * FROM `website` WHERE user = '$usr'";
$result = mysql_query($sql);

    while($row = mysql_fetch_array( $result )) {
		//
		}
if ($result->num_rows = 0 )
{
	echo("noreults");
	echo(header("..\secure.php?error=E2"));
}
?>