if (document.images) {

  visit_collections_off = new Image();
  visit_collections_off.src = "layout2/visit_collections_off.gif";
  visit_collections_on = new Image();
  visit_collections_on.src = "layout2/visit_collections_on.gif";

}

function swap_it(name,state) {

        document[name].src = "layout2/" + name + state + ".gif";

}