How to disable an LOV wrt value in another LOV?

Question

I have a javascript function that works fine if P2_BANK_ASSIGNED is a text item. But if I change it to an LOV is doesn't work. How do I disable an LOV on value of another LOV?
<!--===================================================================-->
<!--FUNCTION TO DISABLE LOV BANK ASSIGNED IF LOV TRIAL IS <> 0 -->
<!--===================================================================-->
<script type="text/javascript">
function disBankAssigned(){
var lReturn = $x('P2_TRIAL').value;
if (lReturn == 0 ) {
     $x('P2_BANK_ASSIGNED').readOnly = false;     
else {
     $x('P2_BANK_ASSIGNED').readOnly = true;     
</script>
onchange="disBankAssigned();"
regards
Paul P

Answer 1

Try $x('P2_BANK_ASSIGNED').disabled = true;     (or false)