if (document.images) {
  bt_tour_off = new Image();bt_tour_off.src="/picts/v_ori/o_bt/ob_01_off.gif";bt_tour_on = new Image();bt_tour_on.src="/picts/v_ori/o_bt/ob_01_on.gif";
  btpbs_off = new Image();btpbs_off.src="/picts/v_ori/o_bt/ob_03_off.gif";btpbs_on = new Image();btpbs_on.src="/picts/v_ori/o_bt/ob_03_on.gif";
  btnoct_off = new Image();btnoct_off.src="/picts/v_inf/i_bt/ib_06_off.gif";btnoct_on = new Image();btnoct_on.src="/picts/v_inf/i_bt/ib_06_on.gif";
  }
function changeImages() {
  if (document.images) {
    for (var i=0; i<changeImages.arguments.length; i+=2) {document[changeImages.arguments[i]].src = eval(changeImages.arguments[i+1] + ".src");}
  }}