Is there any way i can have ingame advertisements every 30-60 seconds?
:-\
It may have something to do with cp.
What a useful reply.
I've done it before with a script to send rcon commands called from cron.
I think there's a patch somewhere to do it too.
P-g-qvm has g_msg and g_msgTime.
g_msg is the message to be repeated, can contain newlines via \n.
g_msgTime is the repeat rate in minutes.
If you want to change it to chat, just remove the CP, and replace it with a print.
I merged it to mine over time as well, so you've got a choice of (as far as I know) two, if you need that feature, or do what David said assuming you're using a Unix-based system.