Move top page ''home'' and ''log in'' to categories tabs

Hello:

How can i move the top page ''home'' and ''log in'' to the horizontal categories tabs.

And then, how can i completely remove the white line on top of the page , where the ''home'' and ''log in'' used to be.

I hope you can help me on this one, please.

Not exactly what you want but there is a 3rd party module to place them in a side box and you can see how they did this and maybe see how to include this in your category sidebox

http://www.zen-cart.com/index.php?main_page=product_contrib_info&cPath=40_52&products_id=669

Do you know where are the php files for categories tabs, so i can try edit them?

All template files are in your template/templates/tpl_filename

This is where they go and copies of the /templates/template_default/templates/tpl_filename are what you edit