var myimages = new Array();
function preloadimages() {
  for (i = 0; i < preloadimages.arguments.length; i++) {
    myimages[i] = new Image();
    myimages[i].src = preloadimages.arguments[i];
  }
}

preloadimages("images/float_ov.jpg","images/horse_ov.jpg","images/car_ov.jpg","images/band_ov.jpg","images/navBG.jpg","images/contactus_ov.jpg","images/facebook_ov.jpg","images/GoldCupTop_01_ov.jpg");

function Doit(imgName,imgObjName) {
  if (document.images) {
    document.images[imgName].src = imgObjName;
}}