$(document).ready(function () {
    setBackgroundImage();
    $(window).resize(function () {
        setBackgroundImage();
    });
    var randomAdvertNumber = Math.floor(Math.random() * $(".advert-content").size()) + 1;
    if ($(".advert-" + randomAdvertNumber)) {
        $(".advert-" + randomAdvertNumber).fadeIn();
    }
    if ($(".advert-image-" + randomAdvertNumber)) {
        $(".advert-image-" + randomAdvertNumber).fadeIn();
    }
    if ($(".advert-title-" + randomAdvertNumber)) {
        $(".advert-title-" + randomAdvertNumber).fadeIn();
    }
    if ($(".advert-content-" + randomAdvertNumber)) {
        $(".advert-content-" + randomAdvertNumber).fadeIn();
    }
}); 
function setBackgroundImage() {
    if ($(window).width() <= 1024)
    {
        $("body").css("background-image", "url(/Content/Images/Backgrounds/background-1024.jpg)");
    } else if (($(window).width() > 1024) && ($(window).width() <= 1280)) {
        $("body").css("background-image", "url(/Content/Images/Backgrounds/background-1280.jpg)");
    } else if (($(window).width() > 1280) && ($(window).width() <= 1440)) {
        $("body").css("background-image", "url(/Content/Images/Backgrounds/background-1440.jpg)");
    } else if (($(window).width() > 1440) && ($(window).width() <= 1600)) {
        $("body").css("background-image", "url(/Content/Images/Backgrounds/background-1600.jpg)");
    } else if (($(window).width() > 1600) && ($(window).width() <= 1680)) {
        $("body").css("background-image", "url(/Content/Images/Backgrounds/background-1680.jpg)");
    } else if (($(window).width() > 1680) && ($(window).width() <= 1920)) {
        $("body").css("background-image", "url(/Content/Images/Backgrounds/background-1920.jpg)");
    } else if (($(window).width() > 1920) && ($(window).width() <= 2048)) {
        $("body").css("background-image", "url(/Content/Images/Backgrounds/background-2048.jpg)");
    } else if ($(window).width() > 2048) {
        $("body").css("background-image", "url(/Content/Images/Backgrounds/background-2560.jpg)");
    } 
};