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) {
    menu01o = newImage("images/menu01o.gif");
    menu02o = newImage("images/menu02o.gif");
    menu03o = newImage("images/menu03o.gif");
    menu04o = newImage("images/menu04o.gif");
    menu05o = newImage("images/menu05o.gif");
    menu06o = newImage("images/menu06o.gif");
    menu07o = newImage("images/menu07o.gif");
    menu08o = newImage("images/menu08o.gif");
    menu09o = newImage("images/menu09o.gif");
    menu10o = newImage("images/menu10o.gif");
    s_menu01o = newImage("images/s_menu01o.gif");
    s_menu03o = newImage("images/s_menu03o.gif");
    s_menu04o = newImage("images/s_menu04o.gif");
    s_menu05o = newImage("images/s_menu05o.gif");
    s_menu06o = newImage("images/s_menu06o.gif");
    s_menu07o = newImage("images/s_menu07o.gif");
    s_menu09o = newImage("images/s_menu09o.gif");
    s_menu10o = newImage("images/s_menu10o.gif");
    s_menu11o = newImage("images/s_menu11o.gif");
    s_menu12o = newImage("images/s_menu12o.gif");
    s_menu13o = newImage("images/s_menu13o.gif");
    s_menu15o = newImage("images/s_menu15o.gif");
    s_menu17o = newImage("images/s_menu17o.gif");
    s_menu19o = newImage("images/s_menu19o.gif");
    s_menu21o = newImage("images/s_menu21o.gif");
    s_menu22o = newImage("images/s_menu22o.gif");
    s_menu23o = newImage("images/s_menu23o.gif");
    s_menu24o = newImage("images/s_menu24o.gif");
    s_menu25o = newImage("images/s_menu25o.gif");
    s_menu27o = newImage("images/s_menu27o.gif");
    s_menu29o = newImage("images/s_menu29o.gif");
    s_menu31o = newImage("images/s_menu31o.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");
}