This week's book giveaway is in the General Computing forum. We're giving away four copies of Arduino in Action and have Martin Evans, Joshua Noble, and Jordan Hochenbaum on-line! See this thread for details.
I have a web site which contains applet menu. For displaying alerts and confirmation dialogs, I call methods in applet (swing dialogs) from my javacript. The problem is - whenever the aplication is showing sucj a swing dialog and I switch to some other browser windows using Alt-Tab and when I try to come back to this window using Alt-Tab, it does not show the swing dialog on the top of window. Moreover it does not allow me to do any click on window since a modal dialog is already open for that window. So it gives an impression like the window has got hanged. But the reason being that modal dialog is some where else and is not showing on the top of window and that dialog is not automatically coming on the top of window when i come back to this window using Alt-Tab.
The best suggestion I can give would be to not use applets for this purpose. JavaScript can open dialogs if you need them, and the browser knows better how to handle them properly (in contrast to applet windows).
Also the other purpose you mention -site navigation- can be handled by JavaScript/CSS very well these days, so an applet might not be necessary.