Código PHP:
function Login()
{
require_once(dirname(__FILE__) .'/DbData.php');
// username and password sent from form
$myusername=$_POST['myusername'];
$mypassword=$_POST['mypassword'];
$myusername = stripslashes($myusername);
$mypassword = stripslashes($mypassword);
$myusername = mysql_real_escape_string($myusername);
$mypassword = mysql_real_escape_string($mypassword);
$mypassword = md5($mypassword);
$sql = "SELECT * FROM users WHERE username ='$myusername' and pass ='$mypassword'";
$result = mysql_query($sql);
$row = mysql_fetch_array($result);
$count = mysql_num_rows($result);
// If result matched $myusername and $mypassword, table row must be 1 row
$Level = $row['grupo'];
$Level = $_POST['Level']; // esto era una prueba e igual no funciona.
$Nombre = $row['fullname'];
$Mail = $row['email'];
session_start();
if($count==1){
$_SESSION["myusername"] = $myusername;
$_SESSION["mypassword"] = $mypassword;
$_SESSION["Level"] = $Level; // trata de no usar mayusculas
$_SESSION["Nombre"] = $Nombre;
$_SESSION["Mail"] = $Mail;
header("location:?action=admin");
}
else {
echo "Usuario o clave incorrecta!!";
}
}