You can add multiple creatives on the same page using Raodblocks. To use it, first you must create two creatives (one with the in-page with floating creative and other with the expanding creative) under the same campaign. Then follow the steps provided in the link below http://www.google.com/support/richmedia/bin/answer.py?answer=146934 to preview the creatives in the same page. 

Also using Local Connect Component you can sync your ads, code them to start at the same time, etc. For more information about Local connection you can follow the next link: http://www.google.com/support/richmedia/bin/answer.py?answer=154881