Fix: Wrong smileys images url

Hi. On my site: Drupal 5 on root
I can't see any images as smileys.
I check html code and see:
<img src="modules/chatblock/images/eh.gif" alt=":eh:">
That isn't showed on page.
But adding "/" in front of image url
<img src="/modules/chatblock/images/eh.gif" alt=":eh:">
Images are now showed on pages

So I patch code:

function chatblock_filter_message($message) {
  $url = '/'.drupal_get_path('module', 'chatblock');

and

function chatblock_help_page() {
  $output = '';
  $url = '/'.drupal_get_path('module', 'chatblock');