place this code in to the Joomla 1.5 index.html at line 53:

JPluginHelper::importPlugin('content');
$tmp_row->text = JResponse::getBody();
$tmp_params = new JParameter(null);
$mainframe->triggerEvent('onMap', array( &$tmp_row, &$tmp_params ), true );
$mainframe->triggerEvent('onPrepareContent', array( &$tmp_row, &$tmp_params ), true );
JResponse::setBody($tmp_row->text);

exactly after the:

...
// trigger the onAfterRender events
JDEBUG ? $_PROFILER->mark('afterRender') : null;
$mainframe->triggerEvent('onAfterRender');