CCK: Fields depending on each other & change fields on the fly during editing

1. Corresponding fields

I want to do the following with a textfield with multiple values & a datefield with multiple values:

Vita:
Company 1 (Text field) -> period (Date field)
Company 2 -> period
etc

Now creating a view where the "Company Text field" and the "Date field" are shown together (& not muddled due to different field sorting).

2. Change fields on the fly with Ajax

I want to do the following with several fields during creating/editing a node:

Textfield 1 is shown, Textfields 2 & 3 are hidden
Textfield 1 -> user select value "A" or "B"

• if A show Textfield 2 immediately
• If B show Textfield 3 immediately

Is one of those goals possible to realize with current available CCK/JS modules? I tried to realise quest 2 with Computed Fields but it doesn't work on the fly (only after saving the node).