Heavy Duty Javascript-ing

The new project I'm working on is moving on quickly and I'm in the middle of some really heavy duty Javascript work for a complicated web form. We are making use of a Javascript library which I think I've mentioned before called the DHTMLXGrid which is a full featured dynamic table solution which can store it's data as XML and HTML. No single bit of it is especially complex but put together it would take several months to duplicate and it only costs £150 for the professional version so we've forked out for it. Well worth a look, even the basic, free version is very good.