/* (c) Kazan Daemon's Code http://www.kazandaemon.ru */

function pesnyabase() {
  var kontainer = document.getElementById('pesnyaproektor');
  var konveer = document.getElementById('pesnyakonveer');
  var position = -kontainer.offsetHeight;
  var maxposition = konveer.offsetHeight;
  konveer.style.top = String(-position)+'px';
  var step = function() {
    position++;
    if (position > maxposition) {
      position = -kontainer.offsetHeight;
    };
    konveer.style.top = String(-position)+'px';
  };
  window.setInterval(step, 50);
};