154162 diary data comparison

To upgrade the [login to view URL] website "day in the life of" section to allow users to choose to compare the daily diary of any two of 6 people. Users will for example choose monday, then choose two people to compare their diary entry for that day. I will need to be able to update the diary content (text and images and internal links) easily, so this should probably be held in a database?, but I suppose this project could be realised in PHP, Ajax or Flash?? Suggestions welcome. The site is hosted on an .asp server and has other database-driven content.