Hi,
I have been trying to reload a widget that is displaying a twitter updates every couple of seconds, I have found this jquery script to do that.

var auto_refresh = setInterval(
function()
{
$('.twitter-hash-tag-widget').fadeOut('slow').load(' script to be loaded  ').fadeIn("fast");
}, 20000);

The problem is that when i put the full php script url it says error 500 server error every time it reloads (using firbug console) I was just wondering because its a widget it may be trying to reload everything in that php script and not just the function that controls the twitter updates. Im not very good at php yet and if someone could figure out what I have to do to get this working, I would appreciate it. Here is the widget source...

<?php
/*
Plugin Name: Twitter Hash Tag Widget
Plugin URI: http://webdevstudios.com/support/wordpress-plugins/
Description: A widget for displaying the most recent twitter status updates for a particular hash tag.
Author: Brad Williams
Author URI: http://webdevstudios.com/
Version: 1.1

        Copyright (c) 2009-2010 Brad Williams (http://webdevstudios.com/)
        Twitter Hash Tag Widget is released under the GNU General Public License (GPL)
        http://www.gnu.org/licenses/gpl-2.0.txt
*/

class WP_Widget_Twitter_Hash_Tag extends WP_Widget {

	function WP_Widget_Twitter_Hash_Tag() {
		$widget_ops = array('description' => __( 'Real time Twitter hash tag following' ) );
		$this->WP_Widget('twitter_hash_tag', __( 'Twitter Hash Tag' ), $widget_ops);
	}

	function widget( $args, $instance ) {
		extract($args, EXTR_SKIP);

		$api_url = 'http://search.twitter.com/search.json';

        $title = ! empty($instance['title']) ? esc_attr($instance['title']) : false;
        $hashtag = ! empty($instance['hashtag']) ? ltrim(esc_attr($instance['hashtag']), '#@') : 'wordpress';
        $number = ! empty($instance['number']) ? $instance['number'] : 3;
		$images = $instance['images'];

        echo $before_widget;
        if ( $title )
            echo $before_title . "<a href='http://search.twitter.com/search?q=#$hashtag'&gt;$title&lt;/a&gt;&quot; . $after_title;

		$raw_response = wp_remote_get("$api_url?q=%23$hashtag&rpp=$number");

		if ( is_wp_error($raw_response) ) {
			$output = "<p>Failed to update from Twitter!</p>\n";
			$output .= "<!--{$raw_response->errors['http_request_failed'][0]}-->\n";
			$output .= get_option('twitter_hash_tag_cache');
		} else {
			if ( function_exists('json_decode') ) {
				$response = get_object_vars(json_decode($raw_response['body']));
				for ( $i=0; $i < count($response['results']); $i++ ) {
					$response['results'][$i] = get_object_vars($response['results'][$i]);
				}
			} else {
				include(ABSPATH . WPINC . '/js/tinymce/plugins/spellchecker/classes/utils/JSON.php');
				$json = new Moxiecode_JSON();
				$response = @$json->decode($raw_response['body']);
			}

			$output = "<ul class='twitter-hash-tag-widget'>\n";
			foreach ( $response['results'] as $result ) {
		   		$text = $result['text'];
			    $user = $result['from_user'];
			    $image = $result['profile_image_url'];
			    $user_url = "http://twitter.com/$user";
				$source_url = "$user_url/status/{$result['id']}";

		    	$text = preg_replace('|(https?://[^\ ]+)|', '<a href="$1">$1</a>', $text);
			    $text = preg_replace('|@(\w+)|', '<a href="http://twitter.com/$1">@$1</a>', $text);
			    $text = preg_replace('|#(\w+)|', '<a href="http://search.twitter.com/search?q=#$1&quot;&gt;#$1&lt;/a&gt;', $text);

			    $output .= "<li>";

				if ( $images )
					$output .= "<a href='$user_url'><img class='twitpic' src='$image' alt='$user' /></a>";
				$output .= "<a href='$user_url'>$user</a>: <div id='twittext'>$text</div></li>\n";
			}
			$output .= "<li class='view-all'><a href='http://search.twitter.com/search?q=#$hashtag'&gt;&quot; . __('View All') . "</a></li>\n";
			$output .= "</ul>\n";
		}

		if ( ! is_wp_error($raw_response) )
			update_option('twitter_hash_tag_cache', $output);

		echo $output;

		echo $after_widget;
	}

	function update( $new_instance, $old_instance ) {
		$new_instance = (array) $new_instance;
		$instance['title'] = ! empty($new_instance['title']) ? esc_attr($new_instance['title']) : '';
		$instance['hashtag'] = ! empty($new_instance['hashtag']) ? ltrim(esc_attr($new_instance['hashtag']), '#@') : 'wordpress';
		$instance['number'] = ! empty($new_instance['number']) ? $new_instance['number'] : 3;
		$instance['images'] = ! empty($new_instance['images']) ? true : false;
        return $instance;
	}

	function form( $instance ) {
        $title = ! empty($instance['title']) ? esc_attr($instance['title']) : '';
        $hashtag = ! empty($instance['hashtag']) ? ltrim(esc_attr($instance['hashtag']), '#@') : 'wordpress';
        $number = ! empty($instance['number']) ? $instance['number'] : 3;
        $images = ! empty($instance['images']) ? $instance['images'] : true;

?>
        <p><label for="<?php echo $this->get_field_id('title'); ?>"><?php _e('Title:'); ?></label>
        <input class="widefat" id="<?php echo $this->get_field_id('title'); ?>" name="<?php echo $this->get_field_name('title'); ?>" type="text" value="<?php echo $title; ?>" /></p>

        <p><label for="<?php echo $this->get_field_id('hashtag'); ?>"><?php _e('Hash Tag:'); ?></label>
        <input class="widefat" id="<?php echo $this->get_field_id('hashtag'); ?>" name="<?php echo $this->get_field_name('hashtag'); ?>" type="text" value="<?php echo $hashtag; ?>" /><br />
		Do not include the #</p>

        <p><label for="<?php echo $this->get_field_id('number'); ?>"><?php _e('Number of tweets to show:'); ?></label>
        <input id="<?php echo $this->get_field_id('number'); ?>" name="<?php echo $this->get_field_name('number'); ?>" type="text" value="<?php echo $number; ?>" size="3" /></p>

		<p><label for="<?php echo $this->get_field_id('images'); ?>"><?php _e('Show images:'); ?></label>
		<input id="<?php echo $this->get_field_id('images'); ?>" name="<?php echo $this->get_field_name('images'); ?>" type="checkbox" <?php checked(true, $images); ?></p>

<?php
	}

}

function wp_widget_twitter_hash_tag_init() {
	add_option('twitter_hash_tag_cache', '');
}

add_action('widgets_init', create_function('', 'return register_widget("WP_Widget_Twitter_Hash_Tag");'));

register_activation_hook(__FILE__, 'wp_widget_twitter_hash_tag_init');

?>

I know this is probably a lot to ask, but any help is appreciated.