Custom Menu PHP Include

[lakaroth]

Hello there, i'v made a custom menu with jquery and etc etc
I want use it instead the normal menù, so i think to use include PHP code like this:

PHP Code:

<?php include(GSTHEMESPATH.$TEMPLATE.'/filename.php'); ?>

or

PHP Code:

<? include("filename.php"); ?>

In any case,the page is included without CSS and does not work...
I have also tried to include CSS and others thing in template.php just copy and past the same code in my external menu but dont work... what i need to do?
Thank you