Warning: mysql_real_escape_string error (no replies)

Hello there,

I need some help with a mysql connection issue with escaping characters.

I keep getting the following error on this page even though the databse, user and password are correct:


Warning: mysql_real_escape_string() [function.mysql-real-escape-string]: Access denied for user 'xxxx'@'localhost' (using password: NO) in /home/elisabet/public_html/demo1/install.php on line 132


and lines 128- 132 say:

function secure($string) {
if (get_magic_quotes_gpc()) {
$string = stripslashes($string);
}
$string = mysql_real_escape_string($string);
return $string;
}

if ($_POST)
{
$error = "";
$db_host = $_POST['host'];
$db_username = $_POST['username'];
$db_password = $_POST['password'];
$db_name = $_POST['db'];

What is wron with the escaping of characters. I tried this on three different servers and still get the same error so the problem is in the code.
Thank you.