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) {
  homeBlack = newImage("assets/homeBlack.png");
  whoweareBlack = newImage("assets/whoweareBlack.png");
  whatwedoBlack = newImage("assets/whatwedoBlack.png");
  whatwehavedoneBlack = newImage("assets/whatwehavedoneBlack.png");
  thingswelikeBlack = newImage("assets/thingswelikeBlack.png");
  contactusBlack = newImage("assets/contactusBlack.png");
  preloadFlag = true;
 }
}