Conditionally disable text area

I have a text area which I want to disable on load if another items value is greater than 0.
I do not want to make the text area read only, as this dispalys right across the page.
I have tried several things, but to no avail. My latest was
<script type="text/javascript">
function disDescription() {
var aa = $v('P148_ITEM_A')
if (aa > '0')
$x_disableItem('P148_ITEM_B', aa);
<script>
onload="disDescription();
{code}
Cheers
Gus
Edited by: Gus C on Sep 28, 2010 7:58 AM

Hi,
You have at least one small problem in code. You do not close script tag
Here is sample how you can do it. Place to page HTML header
<script type="text/javascript">
addLoadEvent(function(){var a=$x('P148_ITEM_A');if(a.value*1>0){$x_disableItem(a,true)}});
</script>Regards,
Jari
Edited by: jarola on Sep 28, 2010 6:24 PM
Item name corrected

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