var ui_gallery_pics = new Array();

function ui_gallery_add(index, picture_url) {
  var image = new Image();
  image.src = picture_url;
  ui_gallery_pics[index] = image;
}
function ui_gallery_show(index) {
  var div_gallery = document.getElementById('div_gallery_picture');
  div_gallery.innerHTML = '<img src="'+ui_gallery_pics[index].src+'" />';
}