Change Right-click menu background color

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http://askubuntu.com – I'm using a modified Ambience theme (found in the Ambience-colors package, here: http://www.webupd8.org/2012/01/download-ambiance-and-radiance-themes.html ) and the right-click menus of the Ambiance colored themes are white, just like the original Ambiance theme on 12.04 (but there are mods for that one) How can I change the color of the right-click menu to black with the Ambiance-color theme? (HowTos)