redirect i wml

<?php
Header("Content-type: text/vnd.wap.wml");
Header("Cache-Control: no-cache, must-revalidate");
Header("Pragma: no-cache");
echo ("<?xml version='1.0'?>");
?>
<!DOCTYPE wml PUBLIC "-//WAPFORUM//DTD WML 1.1//EN"
    "http://www.wapforum.org/DTD/wml_1.1.xml" >
<wml>


<card id="card1" title="Laboration 3 - WAP">

<?php
$id=$_GET['id']; 
if ($id==1)
{
require="sida1.wml"
}
if ($id==2)
{
require="sida2.wml"
}
?>

<p> Välj vilken sida du vill gå till

<select name="choice" value="1" title="Links">
    <option value="1">Sida 1</option>
    <option value="2">Sida 2</option>
  </select>
  
<do type="text" label="Go">
    <go method="get" href="index.wml"> <postfield name="id" value="$(choice)" /> </go> 
  </do>

</p>

</card>
</wml> 

<?php
$id=$_GET['id']; 
if ($id==1)
{
require="sida1.wml"
}
if ($id==2)
{
require="sida2.wml"
}
?>

require("sida1.wml");