Notice: Undefined index: - kluda php!

Notice: Undefined index: submit in c:\program files\easyphp1-8\www\4. scenarijs (issent funkcija + notice)\index.php on line 5

<?
$submit = $_POST['submit'];
if (isset ($submit)){
print ("Test.\n");
}
else{
print ("<form action=\"index.php\" method=\"post\">\n");
print ("<input type=\"submit\" name=\"submit\" value=\"apstiprinat\">\n");
print ("</form>");
}
?>

Kur ir kluda?