Theme Specifier

Hi guys I am using the Quick Adsense plugin which is awesome! I am very satisfied with it, but I would like to slightly modify where my ads are shown.

I have an Adsense ad built into my main theme header. Therefore, I only use two other ads to meet the three ads guideline policy.

My issue is, I would like to add another ad to my mobile theme which currently only shows 2 ads.

Is there a way that I could use maybe a simple if statement to do this; or any other method to achieve this?
Like:

if (theme!=maintheme) then
{
//adsense code
}

I know a little javascript but I am not very good at it. Any help is greatly appreciated.