Setting up two openbox themes with a switch in the menu?

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http://crunchbanglinux.org – I was theming my crunchbang and just realized I need two themes. I have one that is very bright, and it kills my eyes when I am in a dark room, and I used to have a very dark theme, but I couldn't see it when my laptop is in the sun... So I need a switch in my menu to change the themerc, gtkrc and nitrogen. How should I do this? I kinda don't know where to start. I don't know what controls the themes apart from the gui... I'm pretty noob with this stuff, really...EDIT: I just realized I will need to change terminator's colors too... (HowTos)