function aol_get_dateplot( $node_id, $date, &$node = null ) {
	if ( ! is_numeric($node_id) || intval($node_id) != $node_id || $node_id < 0) {
		drupal_set_message( t('Could not generate plot because node id is invalid.', 'warning') );
		return;
	}

	if( $node === null ) {
		$node = node_load( $node_id );
	}

	if( ! $node || $node->type != 'lake' ) {
		drupal_set_message( t('Could not generate plot because node is invalid or incorrect type.', 'warning') );
		return;
	}

	$lake_id = $node->field_lake_id[0]['value'];

	$conn = pg_connect ( "host=xxx port=5432 dbname=xxx user=xxx password=xxx" );
	import_request_variables ( 'gp', 'var_' );

	//$result = pg_query ( $conn, "select plr_get_raw(r_secchi_boxplot(44,'Lake Billy Chinook','Secchi Transparency')) as graph" );
	$result = pg_query( $conn, "select plr_get_raw(r_profile_plot(" . $lake_id . ",'" . $node->title . "','" . $date . "')) as graph" );
	if( $result === false) return null;

	$row = pg_fetch_object ( $result );

	header("Content-Type: image/png");
	echo pg_unescape_bytea ( $row->graph );
}