Aligning space code between ads

Do you mean the adverts appear one above the other? rather than side by side?

This would be because the screen on an iPhone is small, and as your forum's width is flexible, (I.E size relates to the browser size) it will push the 2nd advert onto a new row.
You can see it on a desktop by making your browser window smaller in width until the advert is pushed to a new line.

To fix it, simply put them into a fixed size table with each advert in a different cell. Make sure the width of your table is the correct size for both adverts (ie ad size x 2). This will make the minimum width of your forum the size of the adverts and stop the adverts being pushed onto a new row