function newImage(arg) {
  if (document.images) {
    rslt = new Image();
    rslt.src = arg;
    return rslt;
  }
}

function changeImages() {
  if (document.images && (preloadFlag == true)) {
    for (var i=0; i<changeImages.arguments.length; i+=2) {
      document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
    }
  }
}

var preloadFlag = false;
function preloadImages() {
  if (document.images) {
    head04o = newImage("images/head04o.gif");
    head05o = newImage("images/head05o.gif");
    head06o = newImage("images/head06o.gif");
    head07o = newImage("images/head07o.gif");
    head08o = newImage("images/head08o.gif");
    head09o = newImage("images/head09o.gif");
    head12o = newImage("images/head12o.gif");
    botan1o = newImage("images/botan1o.gif");
    botan2o = newImage("images/botan2o.gif");
    preloadFlag = true;
  }
}

function open_window(html_url,w,h,window_name){
         newWin = window.open(html_url,window_name,
                              "width="+w+",height="+h+",scrollbars=1,status=0,resizable=yes");
}