Flash site to HTML5

Hello, I need to update this site: [login to view URL] It is currently a site that utilizes flash. I'd like it to be accessible through multiple platforms: IOS, android, PC, mac, Safari etc. Perhaps using html5 but I'm open if you have a better approach that supports multiple platforms. The sequences are rendered fla(s), flvs, etc. I can provide them in alternative formats. I'd like to keep the unique nature of the site in tact, with animation embedded etc. I also would like to be able to update the work / video page / and client page internally (xml?). In addition I'd like to be able to post news internally as well.