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) {
    botan01o = newImage("images/botan01o.gif");
    botan02o = newImage("images/botan02o.gif");
    botan03o = newImage("images/botan03o.gif");
    botan04o = newImage("images/botan04o.gif");
    botan05o = newImage("images/botan05o.gif");
    line_up02o = newImage("images/line_up02o.gif");
    line_up03o = newImage("images/line_up03o.gif");
    line_up04o = newImage("images/line_up04o.gif");
    line_up05o = newImage("images/line_up05o.gif");
    line_up06o = newImage("images/line_up06o.gif");
    line_up07o = newImage("images/line_up07o.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");
}