function setup(off_images, on_images) {
 off_images = off_images;
 on_images = on_images;

 this.images = new Array();
 this.imagesX = new Array();

 for (var i=0; i<off_images.length;++i) {
  images[i] = new Image();
  imagesX[i] = new Image();	
  images[i].src = off_images[i];
  imagesX[i].src = on_images[i];	
 }
}

function swap(number,on) 
{
	 if (document.images) {
	  if(on) {  document["image"+number].src = this.imagesX[number].src; }
	  else { document["image"+number].src = this.images[number].src; }
	 }
}

function timeOut(number,length,swapNav) {

if (swapNav){
  swap(number,false);
 }
}