Wifi turns off when screen goes to sleep - how can i disable this?

running 10.8.4 on MBA 2013
is there a way to keep wifi alive when the screen goes to sleep (automatically turns off)?
this is very annoying that i would have some internet connected application running (eg. a download) and then the screen turns itself after a timer and also cuts the wifi. this means i have to keep my screen on if i had a big file to download. is there a way around this? i cannot find any settings addressing this issue/option.
thank you.

edit:
i know there's the option "prevent computer sleeping when screen is off" under power adpter, but i would like it done while running battery.
thank you.

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