How do I set an Apex mulri-row reports form value for the specifc current row using Javascript?

I have a multi-row region based on a table in which I have two particular columns of interest. The first has an LOV defined for which I have set up a pick-list of codes associated with the item's status as "OK" or having some problem, for which there are a small number of set codes associated. Most rows will be OK, but when there is a problem, the pick-list will be used.
When that pick list has been used, there is an optional "comments" column that can be filled in. I want my screen to dynamically enable/disable a pushbutton that links to the comment based on the code. This being row-based, the push-button needs enabling or disabling by row, not as a whole "conditional column". That bit is ok, I think, but I don't know and can't find the syntax for how within the javascript onchange function I set the current row value for a different column to the one that triggered it.
My header function (that doesn't work) is going to be something like this (where the status column LOV having a value = 6 means "OK"). Note I'm using alert for a debug mechamism. The $s line is my failed attempt to set he column value, here with a hard-coded string "Changed COMMENTS":
<script type="text/javascript">
function doActivateButton(object)
if(parseInt(object.value)!='6')
    alert('It is not 6!');
    $s('#COMMENTS','Changed COMMENTS','Changed COMMENTS',TRUE);
else
    alert('It is 6, you know!');
</script>
Ideally, I want any existing comments blanked if the user picks "OK" (6) as the new status, whereas for debug above I'm setting the hardcoded debug string. You will probably also note I realise I haven't properly understood the purpose of the third parameter in the $s API.
(This is a reports region, by the way. A detail block, in forms-speak, with a header block above it.)
Thanks for any assistance.
Mark

Sorry, versions are: Apex 4.1 on Oracle RDBMS 11.2.

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