They use RGB numbers then Transparency numbers.
So go here:
http://www.scriptgenerator.net/generator/html-color-code-generator1.phpChoose a color, see the red, green and blue numbers there? put them as follows:
R G B
So example:
255 60 78
Then at the end of each line, put whether it is transparent or not. 255 = opaque, 175 = transparent.
So example:
255 60 78 175 would be transparent.
Then have a bunch of those colors, 8 is a good amount.
After each 'bunch' in the file, put this:
DIV:[Bunch name here]
So if you had transparents, you could name it this:
DIV:Sky's Transparents
Any questions, ask.