How do I make a small edit to an Openbox theme?

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http://crunchbang.org – How do I edit this theme (Elegant Brit) so that the window titlebar text is on the left or centre, rather than the right?  I also want to change it so that active window titles are no longer bold.Also, how do I install the GTK component for this them (which can be found here)?Cheers. (HowTos)