Yandex over AJAX

yandex .js

/* Code should be self-explanatory
   1) Change the css classes .yandex, .entry-content
   2) Change lang into your language combination.
   3) Pay me $100 for the PHP file :) lol, it's right here.
*/
$('.yandex').click(function(e) {
		e.preventDefault();
		$(this).html('Translating');
		var txt = $('.entry-content').html();
		var postData = {
        "txt" 	: $('.entry-content').html(),
		"lang" 	: 'nl-de'
		}
		$.ajax ({
			url: ccb_options.ccb_uri+"/inc/yandex.php",
			type: 'POST',
			data: postData
			})
				.done(function(html){
				$('.yandex').html('Translate');
				$('.entry-content').html( html);
				})
				.error(function(){alert("error");});
	});

yandex.php

<?php
/* Use Yandex.ru translation to translate tags
 * Template Name: Yandex
 * Since 1.0
 */
class yandex {
	private $APIkey = "GET ONEM"; //See http://api.yandex.com/translate/doc/dg/reference/translate.xml

	public function translate ($text,$lang) {
	  $t 			= urlencode($text);
	  $url 			= "https://translate.yandex.net/api/v1.5/tr/translate?key=";
	  $url			.= "{$this->APIkey}&format=html&lang={$lang}&text={$t}";
	  if ($xml = simplexml_load_file($url)) {
		return $xml;
	  }
	  else return false;
	} // yandex_trans
}

$ya 	= new yandex();
$txt 	= $_POST['txt'];
$lang	= $_POST['lang'];
$trans 	= $ya->translate($txt, $lang);
echo $trans->text;
?>