some small improvements of the gui

interface/web/themes/default/css/navigation/nav_top.css

interface/web/themes/default/css/screen/basemod.css

interface/web/themes/default/icons/x64/client.png

interface/web/themes/default/icons/x64/dns.png

interface/web/themes/default/icons/x64/email.png

interface/web/themes/default/icons/x64/help.png

interface/web/themes/default/icons/x64/monitor.png

interface/web/themes/default/icons/x64/network.png

interface/web/themes/default/icons/x64/server.png

interface/web/themes/default/icons/x64/sites.png

interface/web/themes/default/icons/x64/system.png

interface/web/themes/default/icons/x64/tools.png

interface/web/themes/default/templates/topnav.tpl.htm