You need to convert the video to a Quicktime file. Select the option to save as a quictime High, Med, or Small. Depends on the size of the file.
www.wakepics.com limits you to 20 megs so you may have to save it then check the size by going to the file menu/get info. Try high quality first for web. Then if it's still too big try Med. etc... If you are using iMove the computer automatically creates a quicktime and you can select the share option in the file menu and select for the web....