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function bartik_preprocess_islandora_solr(&$variables) {
	$results = &$variables['results'];
		foreach ($results as &$result) {
			if (!empty($result['solr_doc']['bundle_name'])) {
			$path = url('http://aurltothethumbnail'); //could check bundle for type and link to thumbnail for each type
			$options = array('html' => TRUE);
			$options['attributes']['title'] = $result['solr_doc']['label'];
			$image = theme('image', array('path' => $path));
			$key$result['thumbnail'] = l($image, $result['solr_doc']['url']['value'], $options);
		}
	}
}