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) {
    menu1o = newImage("images/menu1o.gif");
    menu2o = newImage("images/menu2o.gif");
    menu3o = newImage("images/menu3o.gif");
    menu4o = newImage("images/menu4o.gif");
    menu5o = newImage("images/menu5o.gif");
    menu6o = newImage("images/menu6o.gif");
    menu7o = newImage("images/menu7o.gif");
    menu8o = newImage("images/menu8o.gif");
    go_inquiry2 = newImage("images/go_inquiry2.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");
}