Auto Refresh Div – Fatal Error

I am trying to implement this into my site. A specific div that will refresh a list of posts every 10 seconds or so. So far, the code is working perfectly, it refreshes the div just fine.

This is what I have in the header.php file.

<?php wp_enqueue_script("jquery"); ?>

<script>
var auto_refresh = setInterval(
function()
{
$('#loaddiv').fadeOut('slow').load('/wp-content/themes/mysite/get_posts.php').fadeIn("slow");
}, 20000);
</script>

This is all before wp_head().

Here is the problem I am encountering: Since the file is being pulled through the jquery function, the wordpress core functions no longer work. I get this error: Fatal Error: Call to undefined function query_posts….

I have searched all over the net…many people suggest adding an include for wp-load.php or wp-blog-header.php but the problem I run into there is that wordpress will not let you call those files directly so I get another fatal error.

Any help would be appreciated.