Customising the user profile layout

Hi guys

This does'nt work anymore in Drupal 6

/**
* Catch the theme_user_profile function, and redirect through the template api
*/
function phptemplate_user_profile($user, $fields = array()) {
// Pass to phptemplate, including translating the parameters to an associative array. The element names are the names that the variables
// will be assigned within your template.
/* potential need for other code to extract field info */
return _phptemplate_callback('user_profile', array('user' => $user, 'fields' => $fields));
}

Does anybody know what I can use instead of this on the template.php or have a tutorial of how to customize the user profile in D6.

Thanks in advance