function preload_img(src)
{
  img = new Image();
  img.src = src;
}

function set_img(img, src)
{
  img = getElement(img);
  img.src = src;
}

function img_hover(img, src_normal, src_hover)
{
  img = getElement(img);
  preload_img(src_normal);
  preload_img(src_hover);
  set_img(img, src_normal);
  img.onmouseover = partial(set_img, img, src_hover);
  img.onmouseout = partial(set_img, img, src_normal);
}

//****************************************************************************

function preview(root, imgsrc)
{
  body = getFirstElementByTagAndClassName("BODY", null);
  setElementPosition("photo_preview", {x:30, y:document.body.scrollTop + 30});
  img = getElement("photo_preview_img");
  img.onload = function (){
    img.onload = null;
    img.src = root + imgsrc;
  }
  img.src = root + "imgs/ajax-loader.gif";
  showElement("photo_preview");
}

function close_preview()
{
  hideElement("photo_preview");
}