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

function preloadImages() {
  if (document.images) {
    homebtr = newImage("../images/nvhomebtr.gif");
    tllpbtr = newImage("../images/nvtllpbtr.gif");
    movebtr = newImage("../images/nvmovebtr.gif");
    adultbtr = newImage("../images/nvadultbtr.gif");
    eventsbtr = newImage("../images/nveventsbtr.gif");
    lilianabtr = newImage("../images/nvlilianabtr.gif");
    sacarinbtr = newImage("../images/nvsacarinbtr.gif");
    eventsbtr = newImage("../images/nveventsbtr.gif");
		litbtr = newImage("../images/nvlitbtr.gif");
    homebtn = newImage("../images/nvhomebtn.gif");
    tllpbtn = newImage("../images/nvtllpbtn.gif");
    movebtn = newImage("../images/nvmovebtn.gif");
    adultbtn = newImage("../images/nvadultbtn.gif");
    eventsbtn = newImage("../images/nveventsbtn.gif");
    lilianabtn = newImage("../images/nvlilianabtn.gif");
    sacarinbtn = newImage("../images/nvsacarinbtn.gif");
    eventsbtn = newImage("../images/nveventsbtn.gif");
		litbtn = newImage("../images/nvlitbtn.gif");
  }
}

function swapImage(name, state) {
suffix = (state) ? "btr" : "btn";
url = "../images/nv" + name + suffix + ".gif";
source = eval("document." + name);
source.src = url;
}