Qt Designer for web interfaces

[rbp]

hi there,

Qt Designer makes creating an resizable interface with menus, status bar, tab order, shortcuts, etc easy - I love it!
I find it so much more productive than handcrafting the interface.

But that's exactly what I still do for HTML web interfaces.
So I was wondering what you use for designing web interfaces. Do you know of an equivalent GUI builder tool for the web?

Richard