After a lot of work on csses, all works correctly on:
- Firefox 2.0
- Internet Explorer 7
- Internet Explorer 6
- Safari 3 (Windows Beta)
- Opera 9.2

I need to fix the logo and search: i'm not using drupal block to display the box and it doesn't work

Don't worry: your browser works perfectly!

The problems are the stylesheet of the theme because i'm currently working on them to fix some stuff and to add a more web 2.0 interface!