Maybe it's just your cut-and-paste into the forum, but I don't see a single tag in your code sample...I think what you're looking for, however is this, added in your geeklog/config.php file:
Text Formatted Code
//add to $_CONF['user_html'] or $_CONF['admin_html']:
'img' => array('src' => 1, 'alt' => 1, 'align' => 1,
'border' => 1, 'width' => 1, 'height' => 1),
now, if you're trying to use the href link to an .rm file, you're not going to get an image, no matter how hard you try. an img needs to be (for practical purposes) a .gif, .jpg or .png file.