Json: pass array/variable to external js file

I have a php webform that uses an external js file

that external files runs events such as: onload, onchange, and onSubmit

In my php application, I have gathered data from db my using this:

<?php
$reqFlds  = array();
$results = mysql_query("select id, display_name from field where account_id = $acct_id2 and required_flag = 1");
    while($RequireResult = mysql_fetch_assoc($results))
        {
            $reqFlds[] = $RequireResult;
        }
    foreach($reqFlds as &$reqFld)
        {
            $reqFld = "'".$reqFld["id"] . "||" . $reqFld["display_name"]."'";
        }
?>

I then use json to gather the data and dump it into an variable js script inside php application

<script language="javascript">
    var holdReqFlds = <?php echo json_encode($reqFlds); ?>;
</script>

The var/array result displays like this View from page source

<script language="javascript">
    var holdReqFlds = ["'15||Project Requested By'","'18||Project Title'","'20||Banner Details'","'202||Flyer Details'","'2134||If Gl Code Not above'","'5862||Quantity'"];
</script>

Admittedly, I am just learning json, so here is what I can't figure out: how do I feed this value to the function in my external js file?

Below is the javascript function for reference - this will run when the submit button is clicked within php app. In short - i'm passing all the fields flagged as required to the holdReqFlds variable. That var will then be passed to the chkReq() function below and determine if a field is within a fieldset that is currently being displayed

i need to pass the holdReqFlds var to the chkReq() function that is in the external javascript file: How?

 * ###################################
 *  PAGE ONSUBMIT FUNCTION
 * ###################################

function job_onsubmit(action)
{
function isVisible(field) {
    if (field.offsetWidth === 0 || field.offsetHeight === 0) return false;
}

function isBlank(field) {
    if ((field.type == "text" || field.type == "textarea") && field.value.length <= 0) return true;
    if (!(field.checked || field.selected || field.selectedIndex > -1)) return true;
    return false;
}

function chkReq(fieldList) {
    var field = null;
    var blankFields = [];
    for (var i = 0; i < fieldList.length; i++) {
        listItem = fieldList[i].split;
        fieldId = field[0];
        label = field[1];
        field = document.getElementById(fieldList[i].split("||")[0]);
        if (isVisible(field) && isBlank(field)) {
            blankFields[blankFields.length] = fieldList[i].split[1];
        }
    }
    if (blankFields.lentgh > 0) {
        displayError(blankFields);
        return false;
    } else {
        return true;
    }
}

function displayError(blankFields) {
    var msg = "Input required:\n\n";
    for (var i = 0; i < blankFields.length; i++) {
        msg += blankFields[i] + "\n";
    }
}
}