OK, so to summarize:
1) TextArea have a value property (as per DOM 2 specs),
2) Prototype Element#setValue uses the value property (not the HTML
value attribute),
3) Proper, standard compliant way of doing what OP wants:
textArea.value = content.unescapeHTML();
4) Prototype way of doing it:
$(textArea).setValue(content.unescapeHTML());
It's a bit slower (obviously) but you benefit from using a consistant
API for all form elements.
5) Possible non-standard shortcut suggest by Rob (Note that setting
innerHTML on textarea elements is NOT trustable across browsers[1]. I
do NOT recommend it):
textArea.innerHTML = content;
Best,
Tobie
[1] Safari and IE won't update the textarea if the added content
contains HTML tags, whitespace is not respected in IE at all, etc.
see notably: http://stud3.tuwien.ac.at/~e0226430/innerHtmlQuirk.html
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