[Logician]

How can I find the usergroup IDs?

This will help..

if conditional1 is true display, now do conditional2, and so on

Before trying to modify this hack I suggest you first checking Advanced Templates Hack. It has the same conditional power (now for vb templates) and its parsing is just like you want: It parse through the entire template and parse all met conditionals, does not return when found a first true conditional. So you can use it for your needs, say, by creating conditionals in your forumhome template and putting inside your announcement and its HTML code. All of them will be displayed if condition is true..