//Loginovanje
<table width="444" height="54" border="0" cellpadding="0">
  <tr>
    <td><font color="white">Username : </font></td>
    <td><font color="white">Password : </font></td>
    <td>&nbsp;</td>
  </tr>
  <tr><form method="POST" action="">
    <td><input type="TEXT" name="username" class="textbox"></td>
    <td><input type="password" name="password" class="textbox"></td>
    <td><input type="submit" name="send" class="submit"></td>
  </tr></form>
</table>
<?php
$username=$_POST['username'];
$password=$_POST['password'];
$md5pw=md5($password);
$query="SELECT * FROM gz_korisnici WHERE username='$username' and password='$md5pw'" ;
$sq=mysql_query($query);
if($_POST['send']){
echo "" ;

if(mysql_num_rows($sq) == 1){
$_SESSION['username'] = $username ;
$_SESSION['password'] = $password ;
echo "<script>window.location=\"index.php\"</script>" ;
mysql_query("INSERT INTO gz_online (ko,broj) VALUES ('$username','1')");
} else {
echo "<script>alert('Username ili Password nije tacan !')</script>" ;
}
}


?>



//reg



<table width="444" height="54" border="0" cellpadding="0">
  <tr><form method="POST" action="">
    <td><font color="white">Username : </font></td>
    <td><input type="TEXT" name="user" class="textbox"></td>
    </tr>
    <tr>
    <td><font color="white">Password :</font></td>
    <td><input type="password" name="pw" class="textbox"></td>
  </tr>
  <tr>
    <td><font color="white">E-Mail : </font></td>
    <td><input type="TEXT" name="email" class="textbox"></td>
    </tr><tr><td></td>
    <td><input type="submit" name="send2" class="submit" value="Posalji"></td>
  </tr></form>
</table>
<?php
$user=$_POST['user'];
$pw=$_POST['pw'];
$email=$_POST['email'];
$pwmd5=md5($pw);
if($_POST['send2']){
echo "" ;
if($user == "" || $pw=="" || $email == ""){
echo "<script>alert('Unesite podatke !')</script>" ;
} else {
$sql1="INSERT INTO gz_korisnici (username,password,email) VALUES ('$user','$pwmd5','$email')" ;
mysql_query($sql1) or die(mysql_error());
echo "<script>alert('Uspjesno si se registrovao !')</script>" ;

}
}
?>