Lankiz, if (isset($_POST['submit'])) {
echo '<script language="JavaScript">alert("Привет");</script>';
} else {
echo '<form method="post"><p><input type="submit" name="submit" value="Нажимай"/></p></form>';
}
Lankiz, if (isset($_POST['submit'])) {
echo '<script language="JavaScript">alert("Привет");</script>';
} else {
echo '<form method="post"><p><input type="submit" name="submit" value="Нажимай"/></p></form>';
}