Log message

* Added ARIA roles. Removed JAWS hack.
* Removed header_css function, it was overkill

	Modify	/trunk/404.php	diff
	Modify	/trunk/app/display/rollingarchive.php	diff
	Modify	/trunk/app/includes/pluggable.php	diff
	Modify	/trunk/attachment.php	diff
	Modify	/trunk/blocks/k2-header.php	diff
	Modify	/trunk/footer.php	diff
	Modify	/trunk/header.php	diff
	Modify	/trunk/image.php	diff
	Modify	/trunk/index.php	diff
	Modify	/trunk/js/k2.functions.js	diff
	Modify	/trunk/page-archives.php	diff
	Modify	/trunk/page.php	diff
	Modify	/trunk/sidebar.php	diff
	Modify	/trunk/single.php	diff