probleem met whois script

<?php
if ( $_SERVER['REQUEST_METHOD'] == 'POST' )
{
    $domein = $_POST[domein];
    $check = checkdnsrr("$domein$extentie.","NS");
    $dubbelcheck = checkdnsrr("$domein$extentie.","A");

    if ( $check == "1"  || $dubbelcheck == "1" )
    {
        echo ("<p class=\"style29\">Helaas, het domein bestaat al.</p>");
    }
    else
    {
        echo ("<p class=\"style30\">Gefeliciteerd, het domein is nog vrij!</p>");
    }
}
else
{
    echo '
    <form method="post" action="">
    <input type="text"  name="domein" />
    <select name="extentie">
<option value=".com">.com</option>
<option value=".net">.net</option>
<option value=".org">.org</option>
<option value=".biz">.biz</option>
<option value=".info">.info</option>
<option value=".nl">.nl</option>
<option value=".be">.be</option>
<option value=".eu">.eu</option>
<option value=".ws">.ws</option>
<option value=".nu">.nu</option>
<option value=".name">.name</option>
<option value=".bz">.bz</option>
<option value=".tv">.tv</option>
<option value=".cc">.cc</option>
<option value=".us">.us</option>
<option value=".cn">.cn</option>
<option value=".co.uk">.co.uk</option>
<option value=".org.uk">.org.uk</option>
<option value=".in">.in</option>
</select>
    <input type="submit"  value="Controleer"  name="check"  />
    </form>';
}
?>

<?php
if ( $_SERVER['REQUEST_METHOD'] == 'POST' )
{
    $domein = $_POST[domein];
    $check = checkdnsrr("$domein$extentie.","NS");
    $dubbelcheck = checkdnsrr("$domein$extentie.","A");
 
    if ( $check == "1"  || $dubbelcheck == "1" )
    {
        echo ("<p class=\"style29\">Helaas, het domein bestaat al.</p>");
    }
    else
    {
        echo ("<p class=\"style30\">Gefeliciteerd, het domein is nog vrij!</p>");
    }
}
else
{
    echo '
    <form method="post" action="">
    <input type="text"  name="domein" />
    <select name="extentie">
<option value=".com">.com</option>
<option value=".net">.net</option>
<option value=".org">.org</option>
<option value=".biz">.biz</option>
<option value=".info">.info</option>
<option value=".nl">.nl</option>
<option value=".be">.be</option>
<option value=".eu">.eu</option>
<option value=".ws">.ws</option>
<option value=".nu">.nu</option>
<option value=".name">.name</option>
<option value=".bz">.bz</option>
<option value=".tv">.tv</option>
<option value=".cc">.cc</option>
<option value=".us">.us</option>
<option value=".cn">.cn</option>
<option value=".co.uk">.co.uk</option>
<option value=".org.uk">.org.uk</option>
<option value=".in">.in</option>
</select>
    <input type="submit"  value="Controleer"  name="check"  />
    </form>';
}
?>

<?php
if ( $_SERVER['REQUEST_METHOD'] == 'POST' )
{
    $check = checkdnsrr('http://'.$_POST['domein'].$_POST['extentie'],"NS");
    $dubbelcheck = checkdnsrr('http://'.$_POST['domein'].$_POST['extentie'],"A");

    if ( $check == "1"  || $dubbelcheck == "1" )
    {
        echo ('<p class="style29">Helaas, het domein bestaat al.</p>');
    }
    else
    {
        echo ('<p class="style30">Gefeliciteerd, het domein is nog vrij!</p>');
    }
}
?>

<?php
if ( $_SERVER['REQUEST_METHOD'] == 'POST' )
{
    $check = checkdnsrr('http://'.$_POST['domein'].$_POST['extentie'],"NS");
    $dubbelcheck = checkdnsrr('http://'.$_POST['domein'].$_POST['extentie'],"A");
 
    if ( $check == "1"  || $dubbelcheck == "1" )
    {
        echo ('<p class="style29">Helaas, het domein bestaat al.</p>');
    }
    else
    {
        echo ('<p class="style30">Gefeliciteerd, het domein is nog vrij!</p>');
    }
}
?>