refactoring theme 1 - login page

git-svn-id: https://svn.apache.org/repos/asf/james/hupa/trunk@1522229 13f79535-47bb-0310-9956-ffa450edef68
add background of login box

git-svn-id: https://svn.apache.org/repos/asf/james/hupa/trunk@1522230 13f79535-47bb-0310-9956-ffa450edef68