how do i puting a image for online and offlone?

<?php

// Language definitions used in viewtopic.php
$lang_topic = array(

'Post reply'        =>    'Post reply',
'Topic closed'        =>    'Topic closed',
'From'                =>    'From',                // User location
'Note'                =>    'Note',                // Admin note
'Website'            =>    'Website',
'Guest'                =>    'Guest',
'Online'<--- url gos here?  -------->            =>    'Online', <--- OR here?  -------->
'Offline'<--- url gos here?  -------->            =>    'Offline', <--- OR here?  -------->
'Last edit'            =>    'Last edited by',
'Report'            =>    'Report',
'Delete'            =>    'Delete',
'Edit'                =>    'Edit',
'Quote'                =>    'Quote',
'Is subscribed'        =>    'You are currently subscribed to this topic',
'Unsubscribe'        =>    'Unsubscribe',
'Subscribe'            =>    'Subscribe to this topic',
'Quick post'        =>    'Quick post',

'Link separator'    =>    ' | ',    // The text that separates links in posts (website, e-mail, report, edit etc.)
'Mod controls'        =>    'Moderator controls'

);