[support] MT4 migration, prob with node_object_prepare()

I'm following the steps at http://drupal.org/node/860 I realize that this node is not current for 6.x, but I thought I'd give it a whirl, anyway. I've got the following error: Fatal error: Call to undefined function node_object_prepare() in /<xxxxx>/public_html/ab612/includes/common.inc(1537) : eval()'d code on line 29 Can anyone suggest how to update this script for use in Drupal 6?