Take a look at http://www.dhtmlx.com. I have been going thought the many Components that they have. They have DB Admin where you can connect to SQL DB .Great XML Editor . Then a DHTML designer that is really good to start your project. Here is a Video if how it works. They also have FilesCommander This application demonstrates Norton Commander-style file navigation built with DHTMLX components. Components used.
Here more Demo Applications.
Here is a snapshot from my web Calender that am using in Notes DB and its the same as Carl Tyler has for his airplane scheduler . Very easy to modify and their license is GNU GPL v2. plus you can buy license to fit your needs.
Thanks Carl for your help.