override - Joomla 2.5 overriding /com_content/helpers/icons.php -

how override file in own template file in joomla 2.5 ? /com_content/helpers/icon.php

the file isn't view - can't override - via template.

this doc provide clues: http://docs.joomla.org/how_to_override_the_component_mvc_from_the_joomla!_core

can use plugin override