CSS troubles

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Hi

I have created an html template for C5, after watching the screencast tutorial on how to convert html templates for C5(http://www.concrete5.org/help/building_with_concrete5/how-tos/sc1/)
The theme is up and running fine, except 2 things:
1.the connections of the CSS file (default.css)to the php template(default.php)
i have used this script to connect the css to the php file but the C5 still use the css from the core theme
<?=$this->getThemePath()?>/


<?php $this->getThemePath(); ?>

2. how can i align the header nav menu horizontally like in the Plain Yogurt theme?

rutrem