Simple jquery loop for looping through elements and changing class

jquery element class loop

function gvi_slider(el, t, c) {
  var $slides = $(el);

  (function _loop(idx) {
    $slides.removeClass(c).eq(idx).addClass(c);
    setTimeout(function () {
      _loop((idx + 1) % $slides.length);
    }, t);
  }(0));
}