Make a textarea input element and a multiple-choice select box element for v3 dialogs.

[Martin Kou]

The select box dialog that Artur wrote needs a multiple-choice select box element, while the email fields in the link dialog needs a textarea input element.

[Martin Kou]

I've tried for the whole day yesterday and the whole morning today to add a textarea widget but...

1. The problem from #2661 returns, which can be fixed easily by restoring the hack I posted earlier.
2. The textarea element doesn't seem to work as a multi-line text input whenever it is added to inside the dialog - it is rendered *like* a single-line input and it accepts only single-line text (i.e. pressing Enter in it won't produce a new line). But when it is added outside to the dialog, it works.

[Martin Kou]

btw the problems I mentioned are only happening with IE6.

[Martin Kou]

Fixed with [2715] - [2719].