WhatAnimation('fadescroll');
WhatAnimation('moveleft');

$(window).scroll(function(){
    WhatAnimation('fadescroll');
    WhatAnimation('moveleft');
});

function WhatAnimation(name){
    $('.' + name).each(function(){
        switch (name) {
            case 'fadescroll': AddClass(this, 'fade');
                break;
            case 'moveleft': AddClass(this, 'left');
                break;
        }
    });
};

function AddClass(objekt, name) {
    if(IsVisible(objekt)) {
        $(objekt).addClass(name);
    }else{
        $(objekt).removeClass(name);
    }
}

function IsVisible(objekt){
    var viewport = $(window).scrollTop() + $(window).height();
    var rand = $(object).offset();
    rand.bottom = rand.top + $(object).outerHeight();
    return (!(viewport < (rand.top + 250) || $(window).scrollTop() > (rand.bottom - 250)));
}