Animacja progressbaru

function progressbar_status_update(numer_kroku)
{
    var liczba_krokow = 6;

    var ile_procent = 100 / liczba_krokow;

    ile_procent = Math.round(ile_procent);

    var progress_procent = ile_procent * numer_kroku;

    if(liczba_krokow == numer_kroku)
    {
        progress_procent = 100;
    }

    //console.log(ile_procent + ' / ' + progress_procent);

    $('#installation_progress').animate({width: progress_procent+"%"},5000,"linear");
}