how do you boot from the install disk (tiger)?

Oh .. too late I guess. But for the next try:
alt-key > you can select where to boot to.
c > boots to CD or DVD.
Yea I know Diablo ....
Hoever I deal daily with European keyboards.
None of them has anything remotely "Command" saying onthe 'Apple' key, and same is many times valid for 'Option' key -- in about all keyboards it has "alt", in some also option, in European layouts it mostly says just "alt". Thus the bad habit of calling them with those names, it bcomes someitmes automatic to do so to avoid people confusing themselves with control, command, option...