I know it seems simple, but ust give it the directory the images are in, just like you normmally would.
/index.php
<? include_once("$DOCUMENT_ROOT/include/contentbuilder.php");
?>
/include/contentbuilder.php
<?
include_once("$DOCUMENT_ROOT/include/header.php");
?>
/include/header.php
<?
echo "<img src="http://$SERVER_NAME/images.jpg");
?>
More info can be found here.
www.php.net/manual/function.include-once.php
www.php.net/manual/language.variables.predefined.php
Chris Lee