Untitled

<html>
<head>

</head>
<body>
<?php

echo '<form name="envio" action ="select2.php" method="get" >
<select name="selector" onchange="envio.submit();">

   <option value="html">HTML</option>
   <option value="css">CSS</option>
   <option value="js">JavaScript</option>
   <option value="php">PHP</option>
</select>
</form>';
if (isset ($_REQUEST['selector']))
{
    ?>
    <script type='text/javascript'>
    var textoEscogido = '<?php echo $_REQUEST["selector"];?>';
    alert(textoEscogido);
    </script>
    <?php
    echo "estamos dentro";
}


?>
</body>
</html>