mkform.js

//script check scroll to block then load mkt form
var contactUsFormBlock = document.getElementsByClassName('section-contact-us-form')[0];
var Mkt1092LoadCount = 0;

window.addEventListener('scroll', function () {
    if (Mkt1092LoadCount === 0) {
        var hT = contactUsFormBlock.offsetTop,
            hH = contactUsFormBlock.offsetHeight,
            wH = window.innerHeight,
            wS = this.pageYOffset;
        if (wS > (hT + hH - wH)) {
            MktoForms2.loadForm("//app-sn02.marketo.com", "514-XGZ-156", 1092);
            Mkt1092LoadCount = Mkt1092LoadCount + 1;
        }
    }
});

mkform2-array.js

var blockClassScrollToArray = ["call-to-contact-form", "block-bottom-navigation"];
var blockScrollToArray = [];

blockClassScrollToArray.forEach(function (className) {
    var element = document.getElementsByClassName(className)[0]

    var item = {
        class: element,
        value: element.offsetTop
    }

    blockScrollToArray.push(item)
})

//sort array
blockScrollToArray.sort(function (a, b) {
    return a.value - b.value;
});

if (blockScrollToArray.length > 0) {
    var blockFirst = blockScrollToArray[0].class;
    if (blockFirst) {