SetFieldValue not changing the value of a Lookup

Hi, I need to change the value of a lookup based on another fields value. The thing is we are using to hide the text box and selector etc to make the field "ReadOnly":

// Making the Account Manager field Read Only
var accmgrid = rbf_getFieldValue('accountManager');
$('#txtaccountManager').parent('td').hide();
$('#accountManager_' + accmgrid + ' span:nth-child(1) i:nth-child(1)').hide();


OnChange event:

<script>

function onChangeDivision(form)
{
var relDivision = form.contactDivision.value;
if (relDivision != ""){
function cb(values) {
var acctMgr = values[0][0];
//alert(acctMgr);
rbf_setFieldValue('accountManager', acctMgr);
}
rbf_selectQuery("select accountManager from division where id=" + relDivision, 1, cb);
}
}
</script>

Why wont the setfieldvalue set? What other way could i possibly achieve this? We do not want the users to set this value at all.

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