10.5: Start iChat without auto-login

I have auto-login enabled for my iChat accounts, and yet sometimes I start iChat wanting only some of the accounts to go online. Instead of quickly logging off those accounts I don’t want logged in, I hold down the Shift key while iChat is starting. This disables auto-login for that session only — the general preference is still intact, and the next time you start iChat (without using the Shift key), your accounts will auto-login as normal.