a ver si te sirve eso
Código PHP:
<?php require_once('coneccion.php'); ?>
<?php
// *** Validate request to login to this site.
if (!isset($_SESSION)) { nmbre de la seccion
session_start();
}
$loginFormAction = $_SERVER['PHP_SELF'];
if (isset($_GET['accesscheck'])) {
$_SESSION['PrevUrl'] = $_GET['accesscheck'];
}
if (isset($_POST['textfield'])) {
$loginUsername=$_POST['textfield'];
$password=$_POST['textfield2'];
$MM_fldUserAuthorization = "";
$MM_redirectLoginSuccess = "bien.php";
$MM_redirectLoginFailed = "mail.php";
$MM_redirecttoReferrer = false;
mysql_select_db($database, $variablexx);
$LoginRS__query=sprintf("SELECT campousuario, campopass FROM tabla WHERE campousuario='%s' AND campopass='%s'",
get_magic_quotes_gpc() ? $loginUsername : addslashes($loginUsername), get_magic_quotes_gpc() ? $password : addslashes($password));
$LoginRS = mysql_query($LoginRS__query, $variablexx) or die(mysql_error());
$loginFoundUser = mysql_num_rows($LoginRS);
if ($loginFoundUser) {
$loginStrGroup = "";
//declare two session variables and assign them
$_SESSION['MM_Username'] = $loginUsername;
$_SESSION['MM_UserGroup'] = $loginStrGroup;
if (isset($_SESSION['PrevUrl']) && false) {
$MM_redirectLoginSuccess = $_SESSION['PrevUrl'];
}
header("Location: " . $MM_redirectLoginSuccess );
}
else {
header("Location: ". $MM_redirectLoginFailed );
}
}
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Documento sin título</title>
</head>
<body>
<form id="form1" name="form1" method="POST" action="<?php echo $loginFormAction; ?>">
<p>Usuario</p>
<p>
<input type="text" name="textfield" />
</p>
<p>Pass</p>
<p>
<input type="text" name="textfield2" />
</p>
<p> </p>
<p>
<input type="submit" name="Submit" value="Enviar" />
</p>
</form>
</body>
</html>