set_background: function(imgUrl){
        var background = document.getElementById("background");
        background.style.backgroundImage = "url('"+ imgUrl +"')";
    },

    set_user: function(user){
        var user_img = document.getElementById("user_image");
        var user_link = document.getElementById("user_link");
        var username = document.getElementById("username");
        user_img.src = user.profile_image.small;
        user_link.href = user.links.html;
        username.innerText = user.name;
    },