You may have heard about Meebo
before (All-in-one web interface for IM protocols).
Do you have any idea about how they simulate the "windows" ??
For example, here is an alert pseudo-window :
Of course, this is not a real pop-up, only a customized <DIV> i suppose and it can be moved, it's resizable, the content area can scroll etc...
Any idea or suggestion is welcome
[ February 14, 2006: Message edited by: Franck Tranchant ]