este es todo el codigo:
<?php
/* Conexion BD NOTA: NOMBRE TABLA 'stock_pornis' */
$conexion = mysql_connect("mihost", "mibd", "mipass");
$seleccion = mysql_select_db("mibd", $conexion);
/* INTERFAZ */
?>
<HTML>
<BR><BR><BR><TABLE ALIGN='CENTER'>
<TR>
<TD>USUARIO</TD>
<TD><FORM METHOD='POST'>
<INPUT TYPE='text' NAME='user'>
</TD>
</TR>
<TR>
<TD>CONTRASEÑA</TD>
<TD>
<INPUT TYPE='password' NAME='pass'>
</TD>
</TR>
<TR>
<TD COLSPAN=2 ALIGN='CENTER'>
<INPUT TYPE='submit' NAME='sent' VALUE='Enviar'>
</TD>
</TR>
</TABLE>
<?php
if( !empty($_POST['sent']) )
{
if( !empty($_POST['user']) && !empty($_POST['pass']) )
{
$user = $_POST['user'];
$pass = $_POST['pass'];
$frase = "select * from stock_pornis";
$autenticacion = mysql_query($frase,$conexion);
$row = mysql_fetch_array($autenticacion);
if( $user == $row[0] && $pass == $row[1] )
{
header('Location:
www.miweb.com/stock/login.php');
}
else
{
echo "<SCRIPT LANGUAGE='Javascript'> alert('USUARIO O PASSWORD INCORRECTO'); </SCRIPT>";
}
}
else
{
if( empty($_POST['user']) )
{
echo "<SCRIPT LANGUAGE='Javascript'> alert('INTRODUZCA EL USUARIO'); </SCRIPT>";
}
else
{
echo "<SCRIPT LANGUAGE='Javascript'> alert('INTRODUZCA LA PASSWORD'); </SCRIPT>";
}
}
}
?>
</HTML>