the script does work Brock.
you place it in a clean blank mirc remote.. and then in channel you right click a nick and scroll down to you see the nick and the idle time will be displayed ON the menu list.
i still use this snippet myself. and have just this second checked and can confirm it is working
only possible thing for it not working is incorrectly placed or you are using mirc 7.1.
this was only made for 6.35