Flash game for viral email campaign

Hello, We require a flash game to be sent out as a viral email to promote a new website. The game must be simple to use and play as anything too complicated and the user will just close it down. The game would be required to be branded as the website and ideally use a theme of telling people you fancy them. We don’t mind if an existing game is modified to show this. Could you please reply with time, costs and examples of previous work. Thanks, Martin