I tried your example but I don't success to convert my old skin for MEnu to Prometheus.
I have copied all css/img to my app_theme/ folder and under Menu folder
Before my hover effect was solved by
Now nothing works.
I have tried to set
But nothing works
What is more needed and what is the correct settings?
Notable is that my img background is correctly set by the
background: #ececec url('img/tab_inactive.gif') repeat-x;