Adds search form on header.

Changelog:
- 20060125:
- Added Google site search
- Added
autocomplete=onto search input
- 20051208:
- Changed button width and XHTML closing tag
/>
- Changed button width and XHTML closing tag
You might also want to install userscripts.org [search plugin](http://mycroft.mozdev.org/download.html?name=us...).



