Change echo '
', $modSettings['shopCurrencyPrefix'], $message['member']['money'], $modSettings['shopCurrencySuffix'], '<br /><br />
<a href="', $scripturl, '?action=shop;do=invother2;member=', $message['member']['username'], '">View Inventory</a><br />
<a href="', $scripturl, '?action=shop;do=sendmoney;member=', $message['member']['username'], '">Send Money to ', $message['member']['name'], '</a><br />';
to echo '
', $modSettings['shopCurrencyPrefix'], $message['member']['money'], $modSettings['shopCurrencySuffix'], '<br /><br />
<a href="', $scripturl, '?action=shop;do=invother2;member=', $message['member']['username'], '"><img src="' . $settings['images_url'] . '/view_inventory.gif" alt="View Inventory" border="0" /></a><br />
<a href="', $scripturl, '?action=shop;do=sendmoney;member=', $message['member']['username'], '"><img src="' . $settings['images_url'] . '/send_money.gif" alt="Send Money to ', $message['member']['name'], '" border="0" /></a><br />';
You have to make view_inventory.gif and send_money.gif and put these to images dir