Jquery Ajax in wordpress

Hi,

I am trying to auto refresh a div using jquery (for the animation) and Ajax (for the auto refresh). I am doing this by executing a wordpress query every few seconds. The query has been put in a seperate php file.

However, i’m getting an error that keeps refreshing every 3 seconds with an animation so I asume the ajax and jquery part is working.

Fatal error: Call to undefined function query_posts() in aanbieding.php on line 9

None of the wordpress queries I use in the inlcuded aanbieding.php seem to work. The code I used to auto refresh is:

<script type=”text/javascript”>

function getRandom() {
$(“#aanbieding”).hide(“slow”);
$(“#aanbieding”).load(“http://ijzerhandel-amsterdam.nl/new/wordpress/wp-content/themes/ijzerhandel/aanbieding.php&#8221;, ”, callback);
}

function callback() {
$(“#aanbieding”).show(“slow”);
setTimeout(“getRandom();”, 3000);
}

$(document).ready(getRandom);

</script>

PHP code:

<?php query_posts(array(‘orderby’ => ‘rand’, ‘category_name’ => aanbieding, ‘showposts’ => 1)); if (have_posts()) : while (have_posts()) : the_post(); ?>

<div id=”aanbieding_image”>

<?php echo get_image(‘product_foto’); ?>

</div>

<div id=”aanbieding_prijs”>

<h1 class=”prijs”><?php echo get(‘prijs’); ?></h1>

</div>

<div id=”aanbieding_beschrijving”>

<h1 class=”aanbieding”><?php the_title(); ?> </h1>

<?php echo get(‘aanbieding_beschrijving’); ?>

</div>

<?php endwhile; ?>
<?php endif; ?>

url to site: http://ijzerhandel-amsterdam.nl/new/wordpress/

Does anyone know why the queries are not working ?