AJAX Listing : Problem with PHP plugin

<?php

/* AJAX Listing extension for LoudMouth */

class listing {

	function get_idname() {
		return 'id';
	}

	function get_total() {
		global $database;

		$query = "SELECT count(id) FROM #__content";

		$database->setQuery( $query );
		$total = $database->loadResult();
		return $total;
	}

	function get_content($option, $selectedid, $limitstart, $count) {
		global $database;

		$content = '';
		//$option = 'com_content';
		$query = "SELECT title FROM #__content LIMIT $limitstart, $count";
		$database->setQuery( $query );

		if ($rows = $database->loadObjectList()) {
			
			foreach ($rows as $row) {

					$content .= "$row->title
\n";

			}
			//echo "<pre> content : "; var_export($content); //debug
      return $content;
		} else {
			return 'NO DATA';
		}
	}

}

?>