Wrap notices bit in one div, and float it left - then wrap the conditional adsense code in another div and float it right. You will probably need to play around with this. I don't have time to fine tune it but below is the rough code. Google "CSS style guide" or something like that if your not sure how to tweak the divs.
I find it useful to wrap adsense in a div anyway, just to help formatting incase its slow to load. On a side note, you realise adsense advertisers technically pay for content ads (e.g. an advert next to an article, or a forum post). Technically this may be in breach of adsense ToS since this will appear on all pages, not just those with content. However, many users do have non-content adsense ads (google don't seem to enforce this policy too strictly) but never the less be aware of it.
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