Css

git-svn-id: https://ajaxplorer.svn.sourceforge.net/svnroot/ajaxplorer/trunk@3382 3bf36de4-da32-0410-8312-848cfbfe3f7d
Develop new vision theme.
TODO : HeaderResizer does not add css_gradient class anymore, update UMBRA theme accordingly

git-svn-id: https://ajaxplorer.svn.sourceforge.net/svnroot/ajaxplorer/trunk@3383 3bf36de4-da32-0410-8312-848cfbfe3f7d