jQuery sticky element script

sticky.js

var sticky = (function($) {

    var content = '.page-content';
    var element = '.sticky-block';

    if (!$(element).length || !(content).length) 
        return;

    var barHeight = $(element).height();
    var barOffset = $(element).offset().top;

    $(document).on('scroll', checkPosition);

    function checkPosition() {
        if($(window).scrollTop() > barOffset)
            sticky();
        else
            normal();
    }

    function sticky() {
        $(element).addClass('sticky');
        $(content).css('padding-top', barHeight);
    }

    function normal() {
        $(element).removeClass('sticky');
        $(content).css('padding-top', 0);
    }

})(jQuery)