Connecting Addon Files?

[MrTravisL]

I want to get stuff from another file in my addon, right now I have 2 files that have some of the same codes in it. What I want to do is make 1 file and put the stuff that both of the file uses in that file. How would I do that?

I would also like to change the font color in a lua script, not xml. Right now the code is:

LUA

CustomQuest_Header:SetTextColor(r=000/255, g=255/255, b=000/255)

QuestDifficultyColors["header"].font = CustomQuest_Header;

XML

<Font name="CustomQuest_Header"/>

I tried the color code above and I get this:

 Message: ...nterface\AddOns\DetailDisplayer\InterfaceEditing.lua:17: attempt to index global 'CustomQuest_Header' (a nil value)
 Time: 04/27/11 02:03:27
 Count: 1
 Stack: ...nterface\AddOns\DetailDisplayer\InterfaceEditing.lua:17: in main chunk

 Locals: (*temporary) = nil
 (*temporary) = nil
 (*temporary) = <userdata>
 (*temporary) = nil
 (*temporary) = nil
 (*temporary) = nil
 (*temporary) = "attempt to index global 'CustomQuest_Header' (a nil value)"