In regards to the "Creating Random Colors In Flash 5" tutorial

Original Tutorial Link: http://www.kirupa.com/developer/flash5/randomcolor.htm

I have played around with it and made it “rollover” instead of “release”.
However, i don’t really like the random colors selected.

Can i choose a certain color series (yellow for instance; light yellow, dark yellow).

Or make it turn into a specific number of colors on the same square; it can randomly select from a series of colors i have listed?