Joomla Menu

hi i need help with Joomla…
1. have problem, when i add external CSS for creating tabs menu like
this:

http://stilbuero.de/jquery/tabs/

or this:

http://css.maxdesign.com.au/listamatic2/horizontal05.htm

its making them looks bad, because my tabs CSS collisioning with joomla JA_Purity’s template…
(screenshot here: http://pub.ashphp.info/sccc.JPG )
i tried to edit the CSS of the template, tried to place the tabs css in bottom/middle/top of the page and notting helped… any idea?

2. OR there is any super basic clean template of joomla to download for free? no css, etc. i just need this site as a One page site…

Thanks!

You may contact a joomla expert live at website like http://definitivelab.com/ ,etc .