Help! Trying to get this to work

Hi all,

Been working with the scroller found at this page and like it but…

…I’d like to be able to press a button and go to a movie clip sequentially. I.e. press it once and go to mc1, press again and go to mc2 etc. (possibly add a button which goes to a random mc) I’ve been mucking around with the code for a while but can’t get it. Can anyone help with this?