/**

• Deletes a course from the course table
• @private ?
• @param string $field
• Possible values:
• <ul>
• <li>id</li>
• <li>name</li>
• <li>idnumber</li>
• <li>shortname</li>
• </ul>
• @param string $value
• @return boolean
  */
  function delete_course($value, $field){
  }

/**

• Deletes some courses from the course table
• @param string $field
• Possible values:
• <ul>
• <li>id</li>
• <li>name</li>
• <li>idnumber</li>
• <li>shortname</li>
• </ul>
• @param array $values
• @uses delete_course
• @return boolean
  */
  function delete_courses($field, $values){
  }