function header_gallery_shift(direction) {
  var move = 290;
  var stripe = $('#stripe');
  var margin = new Number(stripe.css('margin-left').replace(/\D+$/,''));
  if (direction == 'left') {
    if (margin == 0) {
      margin = -110;
    } else {
      margin -= move;
    }
    if (margin <= -790) {
      margin = -790;
    }
  } else {
    if (margin == -790) {
      margin = -690;
    } else {
      margin += move;
    }
    if (margin >= 0) {
      margin = 0;
    }
  }
  stripe.animate({'marginLeft': margin + 'px'}, {duration: move * 3});
  return false;
}
$(document).ready(function(){
  $('#gb-left').click(function(){
    header_gallery_shift('left');
  });
  $('#gb-right').click(function(){
    header_gallery_shift('right');
  });
});