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/splash_ov_03.jpg","images/n_ov_03.jpg","images/n_ov_04.jpg","images/n_ov_05.jpg","images/n_ov_07.jpg");

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