Glad I was able to help
I just went to check and see if there was such an option as I understand that it sometimes can be annoying to get disturbed with all kinds of messages:
First of all have you checked all PREFERENCES options?
There are features such as tabs that allow you to have all chats through "1 window" and that has tabs for you to switch between each person that you're talking to.
Now considering that this option is enabled and all, you should have a PLUGIN which is called SYSTEM TRAY ICON.
Unless you are not using blackbox/fluxbox or any of those windows managers, you should have a system tray.
Now if you go to
> SYSTEM TRAY ICON
it allows you to enable an option called:
Hide new messages until tray icon is clicked
That way you will have to manually click on the icon before it shows you any messages that you've received. Maybe this will help you!