function newImage(arg) {
   if (document.images) {
      rslt = new Image();
      rslt.src = arg;
      return rslt;
   }
}
 
function changeImage(pic, overpic) {
    if (document.images && (preloadFlag == true)) {
       document[pic].src = overpic;
    }
}
 
var preloadFlag = false;
function preloadImages() {
    frame = new Array();
    a = preloadImages.arguments;
 
    if (document.images) {
      for (i=0; i<a.length; i++) {
        if (a[i].indexOf("#")!=0) { frame[i] = newImage(a[i]); }
      }
      preloadFlag = true;
    }
}