Thanks J, you seem to have explained well the the fix I'm in - all those choices!
Good comment about what am I trying to achieve, which database and which browser.
Well, I can be more specific on that score.
1. I definitely want to target the Firebird open source database - I have experience with it and know the tools.
2. I.E will be the browser - if it runs in others it will be a bonus.
3. The application is a timetabling program (currently written in Delphi for Win 32): it is very graphics intensive (not video) with drag and drop of shapes, right click pop up menus etc - in fact all the things that Windoes apps have aplenty and seem very clunky in browsers.
Many thanks for the advice.
Cron