Sets the breadcrumb trail for the current page.
$breadcrumb: Array of links, starting with "home" and proceeding up to but not including the current page.
function drupal_set_breadcrumb($breadcrumb = NULL) {
$stored_breadcrumb =& drupal_static(__FUNCTION__);
if (isset($breadcrumb)) {
$stored_breadcrumb = $breadcrumb;
}
return $stored_breadcrumb;
}