Odd dynamic behaviour: tree to textarea

Hi
I built an apex page with an apex tree and a textarea. The goal is to be able to click on an item in the tree which then will be added (concatenated) to the already existing value of the textarea.
This is working nicely, however everytime I click the item in the tree the value is added twice to the textarea.
This is how I did the setup:
- I created a page region with a hierarchical tree in which the link object (in the tree query) sets the value of an intermediate item P3_ITEMS through 'javascript:setValue("P3_ITEMS","'||ITEM_CODE||'")'
- After clicking the object in the tree, a dynamic action, which is triggered by an 'onChange' event of the P3_ITEM, then fires a pl/sql expression which concatenates the current P3_TEXTAREA value with the intermediate P3_ITEMS value
As noted above: this is working but results in the tree value being added twice.
I can solve this by changing the onChange to onClick in the dynamic action, but then the user will have to click twice to add the value to the textarea: once on the tree, and once on the intermedia P3_ITEMS value....
Anybody got any ideas on how to fix this?
Thanks!

Hi... that explains the local part at least - bit nervous about mucking around with such things - but the http://artperth.com/01-artistsfilter.html is also returning blanks online - at my end at least. I had thought it might be a mac/firefox thing but then thought perhaps the online samples use a different set of files.

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