Small Scroll Bar Example

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Rimmsy

I have MaxGUI but want to program my own for a full screen game. Ahhh!!!! I'm trying to visualise the code but I can't. It's really frustrating when this happens.

local data_height = 500 
local scrollbar_height = 120
local value# = 25.0 ' %
local scroll_value#=(data_height/100.0) * value
' = (500.0/100.0) * 25 = 125
' So...
local scrollButtonY = ... not sure

So, when I'm at 25% scroll the data will be scrolled by 125 pixels. Riiiiight. I'm with it. So how do I translate this into a scroll button like the ones you hold down and move up and down?