Откуда берутся значения?

var textHolder = document.getElementsByTagName('div')[0],
            text = textHolder.innerHTML,
            chars = text.length,
            newText = '',
            i;

    $("head style").append
    (
            "i{color:#"+parameters['image_text_color']+";}"+
            "        body\
              {\
                background: -moz-radial-gradient(center, ellipse cover, rgba(0,0,0,0.04) 0%, #"+parameters['image_background_color']+" 0%);\
                background: -webkit-gradient(radial, center center, 0px, center center, 0%, color-stop(0%,rgba(0,0,0,0.04)), color-stop(0%,#"+parameters['image_background_color']+"));\
                background: -webkit-radial-gradient(center, ellipse cover, rgba(0,0,0,0.04) 0%,#"+parameters['image_background_color']+" 0%);\
                background: -o-radial-gradient(center, ellipse cover, rgba(0,0,0,0.04) 0%,#"+parameters['image_background_color']+" 0%);\
                background: -ms-radial-gradient(center, ellipse cover, rgba(0,0,0,0.04) 0%,#"+parameters['image_background_color']+" 0%);\
                background: radial-gradient(ellipse at center, rgba(0,0,0,0.04) 0%,#"+parameters['image_background_color']+" 0%);\
               }"+ "i{font-family:'"+parameters['image_font_family']+"', Helvetica, Arial;font-size:"+parameters['image_font_size']+"px;}"+
               "i{text-shadow: 0 0 "+parameters['image_font_shadow_width']+"px #"+parameters['image_font_shadow_color']+", 5px 9px 5px rgba(0, 0, 0, 0.5),"+
              "0 0 10px #"+parameters['image_font_shadow_color']+","+
              "0 0 100px #"+parameters['image_font_shadow_color']+","+
              "0 0 500px #"+parameters['image_font_shadow_color']
            +"}"
    );

    for (i = 0; i < chars; i += 1) {
        newText += '<i>' + text.charAt(i) + '</i>';
    }

    textHolder.innerHTML = newText;

    var letters = document.getElementsByTagName('i'),
            flickers = [5, 7, 9, 11, 13, 15, 17],
            randomLetter,
            flickerNumber,
            counter;

    function randomFromInterval(from,to)
    {
        return Math.floor(Math.random()*(to-from+1)+from);
    }

    function hasClass(element, cls)
    {
        return (' ' + element.className + ' ').indexOf(' ' + cls + ' ') > -1;
    }

    function flicker()
    {
        counter += 1;

        if (counter === flickerNumber)
        {
            return;
        }

        setTimeout
        (
                function ()
                {
            if(hasClass(randomLetter, 'off')) {
                randomLetter.className = '';
            }
            else {
                randomLetter.className = 'off';
            }

            flicker();
        }, 30);
    }

    (function loop() {
        var rand = randomFromInterval(500,3000);

        randomLetter = randomFromInterval(0, chars - 1);
        randomLetter = letters[randomLetter];

        flickerNumber = randomFromInterval(0, 6);
        flickerNumber = flickers[flickerNumber];

        setTimeout(function() {
            counter = 0;
            flicker();
            loop();
        }, rand);
    }());