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                } else {
                    return '(undefined)';
                }
            } else if (obj[prop] === false) {
                return 'NO';
            } else if (obj[prop] === true) {
                return 'YES';
            } else if (obj[prop] === NaN) {
                return '(NOT_A_NUMBER)';
            }
            return obj[prop];
        }, // valueToDisplay

        vetEntries = function (tgt, arr) {
            // checks that all entries do exist
            // if any are missing, write an error
            // return true (OK) or false (NOT OK)
            for (var i = 0; i < arr.length; i += 1) {
                if (typeof arr[i] !== "object") {
                    console.log("ERROR: target definition ->" + tgt + "<- " +
                                "mentions non-existent entry " + i);
                    return false;
                }
                if (arr[i] === null) {
                    console.log("ERROR: target definition ->" + tgt + "<- " +
                                " contains null entry " + i);
                    return false;
                }
                if (arr[i].name === undefined) {
                    console.log("ERROR: target definition ->" + tgt + "<- " +
                                "is missing a \"name\" property " + i);
                    return false;
                }
            }
            return true;
        }, // vetEntries

        // "Your choice" section at the bottom - shared by all target types
        yourChoice = function () {
            var r = '<br>';
            r += "<div class='yourchoice'>";
            r += "<div class='yourchoiceleft'>";
            r += "Your choice:";
            r += "</div>"; // yourchoiceleft
            r += "<div class='yourchoiceright'>";
            r += '<input name="sel" size=3 maxlength=2> ' +
                 '<input id="submitButton" type="submit" value="Submit">';
            r += "</div>"; // yourchoiceright
            r += "</div>"; // yourchoice
            r += "<br>";
            return r;
        };


    return {

        body: function () {
            var r = '';
            r += '<div class="leftright">';

            r += '<p class="alignleft" style="font-size: x-large; font-weight: bold">';
            r += cf('appName');
            r += ' <span style="font-size: normal; font-weight: normal;">';
            r += cf('appVersion');
            r += '</span>';
            r += '</p>';

            r += '<p class="alignright"><span id="userbox">';
            r += appLib.userBoxContent();
            r += '</span></p>';

            r += '</div>';

            r += '<div class="boxtopbot" id="header" style="clear: both;">';
            r += '   <span class="subbox" id="topmesg">If application appears';
            r += '   unresponsive, make sure browser window is active and press \'TAB\'</span>';
            r += '</div>';

            r += '<div class="mainarea" id="mainarea">';
            r += '<br><br><br><br><br><center><p>LOADING . . . PLEASE WAIT</p></center><br><br><br><br><br>';
            r += '</div>';

            r += '<div class="boxtopbot" id="result">&nbsp;</div>';

            r += '<div id="noticesline" style="font-size: small">';
            // r += appLib.fillNoticesLine();
            r += '</div>';
            if (cf('displaySessionData') === true) {
                r += 'Plack session ID: ' + cf('sessionID');
                r += ' (last_seen ' + cf('sessionLastSeen') + ')</br>';
            }
            return r;
        }, // body

        dbrowser: function (dbn) {
            // dfn is dbrowser name
            // dfo is dbrowser object
            var dbo = target.pull(dbn);
            return function (set, pos) {
        
                // console.log("Generating source code of dbrowser " + dbn);
                var r = '<form id="' + dbo.name + '">',
                    len,
                    i,
                    obj,
                    entry,
                    allEntries,
                    needed;
        
                r += '<br><b>' + dbo.title + '</b><br><br>';
        
                if (dbo.preamble) {
                    r += dbo.preamble + '<br><br>';
                }
        
                // determine characters needed for padding (based on longest
                // entry)
                allEntries = dbo.getEntries();
                if (! vetEntries(dbn, allEntries)) {
                    // no point in going any further
                    return null;