diff a/protected/models/SystemStatus.php b/protected/models/SystemStatus.php	(rejected hunks)
@@ -111,4 +111,14 @@
 			'criteria'=>$criteria,
 		));
 	}
+	
+	public function notReserved()
+	{
+		$this->getDbCriteria()->mergeWith(
+				array(
+						'condition' => 'reserved = 0',
+				)
+				);
+		return $this;
+	}
 }
\ No newline at end of file
