<?
if (isset($_POST["siunciam"])) {
if($_POST["vardas"] == "kazkoksvardas" && $_POST["slaptazodis"] == "kazkoks slaptazodis"){
echo "Teisingai";
} else {
echo "Neteisingai";
}
}
?>

<form action="<? $PHP_SELF ?>" method="post" name="siunciam">
<input type="text" name="vardas">
<input type="password" name ="slaptazodis">
<input type="submit" name="siunciam" value= "Bandom">
</form>