Reading values from radio buttons

[Maujor]

Can't figure out why this code don't work.
Help will be appreciate

<form action="radio.php">
<input type="radio" name="radiobutton" value="value1" />Yes <br />
<input type="radio" name="radiobutton" value="value2" checked="checked" />No <br />
<input type="submit" value="OK" />
</form>
<?php
if($_POST['radiobutton'] == "value1"){
    echo "The choice was YES";
}
elseif($_POST['radiobutton'] == "value2"){
    echo "The choice was NO";
} 
?>

[Jelena]

You haven't defined the method in yor form tag.
<form action="radio.php" method="POST">

[Maujor]

Hello Jelena,
Rsss! Thank you!